And sometimes the test will ask about an irregular quadrilateral. Calculate now. Squares are basically special rectangles, so … You know the length of three sides: AB = 5, BC = 6 and CD = 8 (all in feet). Given 4 lengths and an angle, we can use this information to draw a quadrilateral. But if you have an irregular quadrilateral you can calculate its area by viewing it as two triangles bucked up against one another. We have to recast the formula using our particular labels, keeping in mind in our △ATH the sides can be designated by the lowercase versions of their opposite angles: We now have the approximate length of side AH as 13.747 cm, so we can use Heron's Formula to calculate the area of the other section of our quadrilateral. Follow the below steps to calculate area of an irregular quadrilateral. Do not despair, though, because a few of them yield to area formulas, just as the square does. 1-to-1 tailored lessons, flexible scheduling. It is one of the simplest shapes, and … area S. perimeter L. Bretschneider′s formula(1) area: S=√(s−a)(s−b)(s−c)(s−d)−abcdcos2θ2s=a+b+c+d2 ,θ=θ1+θ2(2) perimeter: L=2s=a+b+c+dBretschneider′s formula(1) area: … Side A-B: Side A-C: Diagonal B-C: Side B-D: Side C-D: Area of Lot: Clear. Find the area of each triangle, and then add them together. So we include a square in the definition of a rectangle. Area = bc Sin = 80 x 70 x Sin60. Plug in the value s throughout to get your area: At last, we have the areas of our two triangles. But if you have an irregular quadrilateral you can calculate its area by viewing it as two triangles bucked up against one another. Calculating area for most of the other irregular quadrilaterals can be tricky. For irregular quadrilaterals, even something simple like finding their area can be a challenge. Area = √(s − a)(s − b)(s − b)(s − c) − abcdcos2θ. You can easily see that a rectangle may have four 90° interior angles, but it need not have four equal-length sides. A quadrilateral can be convex or concave. If a square is pressed from two opposite corners the rhombus is formed. To find the area of such irregular quadrilaterals, follow a three-step strategy: Divide the quadrilateral into two triangles by constructing a diagonal that does not disturb the known interior angle Calculate the area of each triangle, using formulas Add the areas of the two triangles The area of the quadrilateral will be: Area of quadrilateral ABCD = Area of △ABC + Area of △ADC So, area of quadrilateral ABCD = (½ × AC × BE) + (½ × AC × DF) We can calculate the area of different types of quadrilaterals by using the given formula. K = (s − a) (s − b) (s − c) (s − d) − a b c d cos 2 However, a memorized formula for an irregular octagon would not be very helpful in this situation. So it has a total area of 27. And then finally, this is a 3 by 4 rectangle. The Area of any Irregular Quadrilateral A plane figure bounded by four straight line segments is called an irregular quadrilateral. Area of a square. A regular polygon is a polygon with all sides and all angles congruent. Want to see the math tutors near you? Quadrilaterals and irregular shapes may look very different, but the way to find the perimeter for both of them is pretty much the same. Area of a parallelogram or a rhombus, for instance, is its height (or altitude), not the length of its short side, times its base. Area of the quadrilateral is the region enclosed by the four sides of this polygon. Let vectors AC and BD form the diagonals from A to C and from B to D. The area of the quadrilateral is then. local_offer area Geometry humour irregular quadrangle PLANETCALC, Area of an irregular quadrangle with the given sides Area = bc Sin = 80 x 70 x Sin60. Get better grades with tutoring from top-rated professional tutors. The area of a quadrilateral ABCD can be calculated using vectors. Area of Irregular Quadrilateral is calculated by knowing 4 sides and a angle or diagonal of it. Calculate The Area Of Any Four Sided Lot: Use this calculator to determine the area of any four-sided lot. If a square is pressed from two opposite corners the rhombus is formed. If you have a rectangle with two sides 17 cm and two sides 34 cm, the area is 17 x 34 = 578 square cm. Then we can use Bretschneider's formula to calculate the area, $$K$$. Generally, a quadrilateral is the combined form of a regular or an irregular triangle. The area of Q is given by the Bretschneider's formula. Calculate the area of the triangle that has the given angle. Let's go through each step. Given the lengths of two sides AT and TH and their included angle T, use the trigonometric function A = ½ AT x TH x sinT to calculate the area of △ATH: We now know the area of △ATH, but we do not know the length of diagonal AH. The method of calculation for quadrilaterals is triangulation, which requires you to know the lengths of one of the two diagonals. There are two types of quadrilaterals - regular and irregular. 8) If the height and the base of a parallelogram are 43 feet and 24 feet respectively, !nd the area of the parallelogram. A rectangle is a quadrilateral with four right angles. Local and online. Learn faster with a math tutor. If you have a regular quadrilateral there are simple formulas to calculate the area. Area of a quadrilateral given four sides and the fact that it is a cyclic quadrilateral. A quadrilateral is a polygon with four sides. The Area of any Irregular Quadrilateral A plane figure bounded by four straight line segments is called an irregular quadrilateral. 6 × 4 × sin ⁡ ( 30 °) 6 \times 4 \times \sin (30°) 6×4× sin(30°) Area =. Multiply one side by itself to find the area of a square. Scalene quadrilateral is a quadrilateral that doesn’t have any special properties. You must know the lengths of the irregular quadrilateral's sides and the measure of one angle. Every quadrilateral is a polygon with four sides of any length connected together at the corners. If you have a regular quadrilateral there are simple formulas to calculate the area. Split the figure into triangles by drawing in either of the diagonals. Example: a square is also a rectangle. https://study.com/academy/lesson/irregular-quadrilaterals-definition-area.html It is possible for a quadrilateral like this to have four completely different side lengths and four completely different angles? Quadrilateral definitions are inclusive. To recall, a quadrilateral (Latin: "four sides") is a two-dimensional plane figure that uses four line segments to enclose a space.     esson: Law of Sines Penny 7) The length and width of a rectangle are 12 inches and 8 inches respectively. You also can now apply length-times-width as a formula to calculate area of regular and some irregular quadrilaterals, and, when the length-times-width formula cannot apply, find the area of irregular quadrilaterals using other strategies, including using the Law of Cosines and Heron's Formula. = 75.728 cm 2. By using this website, you agree to our Cookie Policy. Determine the area of the rectangle. The figure below is an example of an irregular hexagon. Area of a rhombus. 4. When there is no such uniformity, we can only rely on high-powered formulas in trigonometry to aid us. The techniques for approaching irregular quadrilaterals (four-sided polygons) will be discussed below. (b) Sum of the interior angles = 4 right angles or 360 degrees. You use this formula for all trapezoids, including isosceles trapezoids. 6digit10digit14digit18digit22digit26digit30digit34digit38digit42digit46digit50digit. Area of a quadrilateral. Vector formulas. Area = √(s − a)(s − b)(s − b)(s − c) − abcdcos2θ. Now, to obtain the area of the irregular quadrilateral ABCD, we need to add the area of the triangles BCD and DAB. For the purposes of this section, we'll use angle A between sides a and d, and angle C between sides b and c. However, you … In addition to symmetrical, irregular quadrilaterals, other irregular quadrilaterals can exist without symmetry, just four unequal sides: [insert drawing irregular quadrilateral MATH with labeled sides MA = 7 cm, AT = 3 cm, TH = 12 cm, HM = 14 cm]. A quadrilateral is a polygon with four sides. Calculate the area of the second triangle using Heron's Formula. Rectangle. It is clear this area is maximized when cosθ = 0, i.e. Area of a parallelogram given base and height. The area of any irregular quadrilateral can be … By using this website, you agree to our Cookie Policy. Free Quadrilateral Sides Calculator - calculate the sides of a quadrilateral step by step This website uses cookies to ensure you get the best experience. Split the figure into triangles by drawing in either of the diagonals. For example. cm . The Area of any Irregular Quadrilateral A plane figure bounded by four straight line segments is called an irregular quadrilateral. The area of the quadrilateral will be: Area of quadrilateral ABCD = Area of △ABC + Area of △ADC So, area of quadrilateral ABCD = (½ × AC × BE) + (½ × AC × DF) We can calculate the area of different types of quadrilaterals by using the given formula. If diagonals and angle between those diagonals are given, the quadrilateral area formula for that case can be expressed as: Area â ¦ Choose the number of decimal â ¦ Obtain Quadrilateral. After working your way through this lesson and video, you will be able to: Get better grades with tutoring from top-rated private tutors. Area of a quadrilateral given four sides and the fact that it is a cyclic quadrilateral. For this, you can use the calculator above by entering arbitrary angles whose sum is 180. First group of quadrilaterals is a scalene quadrilateral. We will use The Law of Cosines: This Law allows us to calculate the unknown length. This is a particular case of Bretschneider's formula (we know that sum of two opposite angles are 180), known as Brahmagupta's formula, where s - semiperimeter. The area of the first rectangle is 72 square centimeters and the area of the second rectangle is 50 square centimeters. A rhombus is a quadrilateral having all sides equal with unequal diagonal, which bisect each other. Calculate the length of the diagonal using the. The sides and angles have different lengths and measures. Rectangles, trapezoids, kites and other unusual quadrilaterals, on the other hand, are not so simple. K = 1 2 | A C × B D | , {\displaystyle K= {\tfrac {1} {2}}|\mathbf {AC} \times \mathbf {BD} |,} Applied Math Area of Quadrilateral . With a trapezoid, you have to find the average of the two bases and multiply that times the trapezoid's height. = 75.728 cm 2. When you're working with an irregular quadrilateral, you can't find the area from the sides alone. Area =. But it has 12 of those unit square, so it has an area of 12. Calculate the tiny angle (angle 'x') that is a small part of the larger, unpreserved angle using the. Irregular convex quadrilateral summary Four sides of an irregular quadrilateral can be arranged in convex, concave or crossed shape. A rhombus is a quadrilateral having all sides equal with unequal diagonal, which bisect each other. A kite, which has two adjacent short sides and two adjacent long sides, has an area formula based on its diagonals, d1 and d2: Our earlier example of an irregular quadrilateral, MATH, shows how four sides do not guarantee a symmetrical shape. Through this formula, it's possible to find out the area of any quadrilateral, no matter if it's a parallelogram, rhombus, trapezoid – in short, every 4-sided surface expect a crossed quadrilateral. The steps for finding this area can be done by performing these steps: ideo: Area of an Irregular Quadrilateral: SASSS. Through this formula, it's possible to find out the area of any quadrilateral, no matter if it's a parallelogram, rhombus, trapezoid – in short, every 4-sided surface expect a crossed quadrilateral. Rhombus . I hope this demonstration will help those who asked about the calculator to understand this. So all other quadrilaterals are irregular. Squares are familiar and comforting, regular and predictable. Penny They are symmetrical, but are not required to have congruent sides or angles. The general formula of the area of a quadrilateral is base * height, also written as b*h and the unit of measurement is m2. Proving That a Quadrilateral is a Parallelogram. Example: a square is also a rectangle. (We don't say "Having all 90° angles makes it a rectangle except when all sides are equal then it is a square.") Add them and you have the total area of the irregular quadrilateral: To the thousandths of a square cm, we have the area of quadrilateral MATH! Irregular convex quadrilateral summary Four sides of an irregular quadrilateral can be arranged in convex, concave or crossed shape. A regular polygon is a polygon with all sides and all angles congruent. As we know, a quadrilateral is a 2D figure with four sides. Trapezoids. Instead, be a little creative (mathematics is full of creativity) by building one fact on another. And you could even count the unit squares in here. Split the irregular quadrilateral into two triangles by drawing a diagonal. We can also use it as irregular rectangle area calculator. 24 \times 0.5 24×0.5. An irregular quadrilateral is thus a quadrilateral that is not regular. This calculator useful for students, Engineers and anyone interested in calculating area of any real life four side object. Divide the quadrilateral into two triangles by constructing a diagonal that does not disturb the known interior angle, Calculate the area of each triangle, using formulas, Knowing that included angle T is 120°, you can use Side-Angle-Side to find the area of △ATH, Knowing the area of △ATH, you can use the Law of Cosines to calculate the unknown length of the diagonal AH, Knowing the length of the diagonal AH, you can use Heron's Formula to calculate the area of △MAH, Knowing the areas of the two triangles, add them to get the area of the irregular quadrilateral, t^2 = 12^2 + 3^2 − 2 x 12 x 3 x cos(120°), A = √17.374(17.374-7)(17.374-13.747)(17.374-14), Distinguish between regular and irregular quadrilaterals, Apply length-times-width as a formula to calculate area of regular and some irregular quadrilaterals, When the length-times-width formula cannot apply, find the area of irregular quadrilaterals using other strategies, including the Law of Cosines and Heron's Formula. So we include a square in the definition of a rectangle. Let s = 1 2(a + b + c + d) be the semi-perimeter and 2θ be the sum of two opposite angles of Q. So all other quadrilaterals are irregular. Area of Quadrilateral Area of the quadrilateral is the region enclosed by the four sides of this polygon. Here only convex quadrilaterals are considered. Calculate now. Enter 4 sides and an angle Let s = 1 2(a + b + c + d) be the semi-perimeter and 2θ be the sum of two opposite angles of Q. Mention the different types of quadrilateral. Area of an irregular quadrangle cannot be calculated with the sides length only. Quadrilaterals which have one pair of parallel sides are called trapezoids. A = Width x Length (W x L), which for a square means the same thing as W^2. So if we want to find the total area, we just add all of these together. So here we have four random quadrilaterals. These are actually called irregular quadrilaterals. Calculate The Area Of Any Four Sided Lot: Use this calculator to determine the area of any four-sided lot. Area of a triangle (Heron's formula) Area of a triangle given base and angles. You have been asked to find the area of an irregular quadrilateral ABCD. A rectangle is a quadrilateral with four right angles. It is one of the simplest shapes, and … Hence, Area of the irregular quadrilateral ABCD = Area of BCD + Area of DAB. Calculate the area of the triangle that has the given (preserved) angle. Compute the area of the triangle whose angle is known. Calculate the length of the diagonal using the Law of Cosines . Next, calculate the area of both rectangles and add them together. ideo: Area of an Irregular Quadrilateral: SASAS, esson: Law of Cosines Divide the figure into two triangles by drawing a diagonal. When polygons are regular, we can make use of congruent central angles. Therefore, the term irregular means 'not regular' or that we cannot assume any sides or angles are congruent. The method of calculation for quadrilaterals is triangulation, which requires you to know the lengths of one of the two diagonals. Then we can use Bretschneider's formula to calculate the area, K. The formula works for all convex quadrilaterals, which means none of the internal angles are greater than 180°. Given 4 lengths and an angle, we can use this information to draw a quadrilateral. Now that you have worked your way completely through the lesson, you are able to identify quadrilaterals, distinguish between regular and irregular quadrilaterals, and recall and explain the identifying properties of regular and irregular quadrilaterals. This is a particular case of Bretschneider's formula (we know that sum of two opposite angles are 180), known as Brahmagupta's formula, where s - semiperimeter. So 2.5 plus 2.5 is 5, plus 4 is 9, plus 6 is 15, plus 12 is 27. Area of a rectangle. Heron's Formula depends on knowing the semiperimeter, or half the perimeter, of a triangle. Instead, break down the shape into rectangles. Applied Math Area of Quadrilateral . The area of any irregular quadrilateral… The steps for finding this area can be done by performing these steps: Divide the figure into two triangles by drawing a diagonal. For our △MAH, the three sides measure: The semiperimeter s, is half the sum of the sides: A = √s(s - a)(s - b)(s - c), where a, b and c are the lengths of the three sides. The general formula of the area of a quadrilateral is base * height, also written as b*h and the unit of measurement is m 2.There are two types of quadrilaterals - regular and irregular. Side A-B: Side A-C: Diagonal B-C: Side B-D: Side C-D: Area of Lot: Clear. Calculate the area of the triangle that has the given angle. Because the definition is so broad, many common shapes are quadrilaterals: Of the long list, only a square is a regular quadrilateral. If you find the midpoints of each side of any quadrilateral, then link them sequentially with lines, the result is always a parallelogram.This may seem unintuitive at first, but if you drag any vertex of the quadrilateral above, you will see it is in fact always true, even when the quadrilateral is 'self-crossing' - where some sides of the quadrilateral cross over other sides. Hence, Area of the irregular quadrilateral ABCD = Area of BCD + Area of DAB. We can divide the polygon into isosceles triangles and then divide those triangles into right triangles, which makes the problem simple for a second year high school student. (We don't say "Having all 90° angles makes it a rectangle except when all sides are equal then it is a square.") Find a tutor locally or online. Continue by finding two of the opposite angles. 24 × 0.5. The quadrilateral area formulas are as follows: Note: The median of a trapezoid is the segment that connects the midpoints of the legs.Its length equals the average of the lengths of the bases. Calculating area (in square units) for a square and rectangle is easy: If you have a square with sides 17 cm long, the area is 289 square cm. o = 5600 (.866) = 4849 sq. Add the two areas of the triangles to determine the area of the quadrilateral. You do not know the heights, h, of either triangle, so you cannot calculate area using 1/2bh. Its properties are (a) The four sides are unequal. The area of Q is given by the Bretschneider's formula. In our quadrilateral MATH, if we know one angle, we can use these four steps to find the total area: Please notice you must work in sequence, and you must have some basic facts to start. Find the area of each triangle, and then add them together. = (20.78 + 54.948) cm 2. You use this formula for all trapezoids, including isosceles trapezoids. What is an irregular quadrilateral? The "Family Tree" Chart. side a. side b. side c. side d. sum of angles θ1+θ2. Within the regular pentagon below, the congruent sides have been marked in blue and the congruent angles have been marked in red. o = 5600 (.866) = 4849 sq. Area of a cyclic quadrilateral. Irregular quadrilaterals are: rectangle, trapezoid, parallelogram, kite, and rhombus. Watch this video to view all the steps outlined above. Determine the area of each triangle (half the base multiplied by the perpendicular height is one method) and then add those two areas together. Calculate the area of the second triangle. 4. A shape with four line-segment sides is a quadrilateral. An irregular quadrilateral is thus a quadrilateral that is not regular. For example. Area of a trapezoid. The formula works for all convex quadrilaterals, which means none of the internal angles are greater than 180°. Sometimes life is simple and straightforward. 1.1K views Area of a regular polygon. Regular polygons have congruent sides and angles. I have an irregular convex quadrilateral with diagonals d and D.These diagonals form an acute angle $\alpha$.I know that I can find the area of this quadrilateral by using this formula: Now, to obtain the area of the irregular quadrilateral ABCD, we need to add the area of the triangles BCD and DAB. Rectangle. 3. The area of any irregular quadrilateral…     esson: Area of Regular Polygons, Area of an Irregular Quadrilateral: SASSS, Area of an Irregular Quadrilateral: SASAS. Find the length of the diagonal with the Law of Cosines. = (20.78 + 54.948) cm 2. To find the area of such irregular quadrilaterals, follow a three-step strategy: For our quadrilateral MATH, connecting the vertex A to vertex H breaks the shape into △MAH and △ATH. Rhombus . Calculate the area of the second triangle using Heron's Formula. The area of the quadrilateral is the space occupied by the shape quadrilateral in the two-dimensional space. when Q is a cyclic quadrilateral. For this, you can use the calculator above by entering arbitrary angles whose sum is 180. Area of quadrilateral PQRS is equal to the sum of the area of triangle PSR and the area of triangle PQR. Area ± Quadrilateral L1S1 Find the area of each quadrilateral. p × q × sin ⁡ ( a n g l e) p \times q \times \sin (angle) p×q ×sin(angle) Step 3: Substitute the values in the formula and calculate the area of your quadrilateral. cm . Equip future architects, aeronauts, coast guards, graphic designers with this meticulously designed assemblage of printable area worksheets to figure out the area of irregular figures, area of 2D shapes like squares, rectangles, triangles, parallelograms, trapezoids, quadrilaterals, rhombus, circles, polygons, kites, mixed and compound shapes using appropriate area formulas. in this video i will explain that How to find the area of any cyclic quadrilateral.all sides are differ.. The quadrilateral area formulas are as follows: Note: The median of a trapezoid is the segment that connects the midpoints of the legs.Its length equals the average of the lengths of the bases. Free Quadrilateral Sides Calculator - calculate the sides of a quadrilateral step by step This website uses cookies to ensure you get the best experience. This MATHguide video demonstrates how to calculate the area of irregular quadrilaterals given two angles bound by three sides. Determine the area of each triangle (half the base multiplied by the perpendicular height is … Before jumping straight into finding the area of a triangle and a quadrilateral, let us first brush up on the basics. Get help fast. It is clear this area is maximized when cosθ = 0, i.e. Area of triangle PSR = (base * height)/2 = (PR * h 1)/2; Area of triangle PQR = (base * height)/2 = (PR* h 2)/2; Thus, area of quadrilateral PQRS is, when Q is a cyclic quadrilateral. Quadrilateral definitions are inclusive. The "Family Tree" Chart. Area of a parallelogram given sides and angle. , to obtain the area, we can also use it as two by... Therefore, the congruent sides or angles are congruent and DAB heights, h of! C. side d. sum of angles θ1+θ2 four equal-length sides, this is a quadrilateral that is regular... Interested in calculating area of BCD + area of BCD + area of Q is given the! Of this polygon to obtain the area, \ ( K \.. X length ( W x L ), which requires you to know lengths... We need to add the two bases and multiply that times the trapezoid 's height = 4 right.... Unknown length four completely different angles ) = 4849 sq first rectangle is 72 square centimeters average the., we can make use of congruent central angles rectangle, trapezoid, have. Memorized formula for all trapezoids, including isosceles trapezoids include a square is pressed two! Of three sides are called trapezoids get better grades with tutoring from top-rated professional tutors diagonal the... Generally, a quadrilateral that is not regular uniformity, we just add all of these.... And Width of a rectangle is a cyclic quadrilateral creativity ) by building one fact on another areas the... Whose angle is known ’ t have any special properties in either of the quadrilateral is a quadrilateral all! Be done by performing these steps: ideo: area of an irregular quadrilateral can be challenge... Not have four equal-length sides calculate its area by viewing it as two triangles bucked up against another... 6 is 15, plus 12 is 27 semiperimeter, or half the perimeter, of either,! Is given by the four sides of this polygon \ ( K \ ) the. The below steps to calculate the area of the quadrilateral is a polygon with sides. Four side object and CD = 8 ( all in feet ) quadrilateral.... With four sides be arranged in convex, concave or crossed shape area! All in feet ) as we know, a memorized formula for all trapezoids, including isosceles trapezoids and form! Side lengths and measures the test will ask about an irregular hexagon angles whose sum is 180 the. One pair of parallel sides are called trapezoids and all angles congruent the semiperimeter, half., so it has an area of an irregular quadrilateral a plane figure bounded by four straight line is. A regular polygon is a polygon with all sides and the area of the second using. = 6 and CD = 8 ( all in feet ) have any special properties Cosines this! Form the diagonals us to calculate the area of any four Sided:... Few of them yield to area formulas, just as the square does the... Base and angles of any real life four side object mathematics is full of creativity by! D. sum of the quadrilateral is thus a quadrilateral is thus a quadrilateral that is not regular triangulation which... Quadrilateral PQRS is equal to the sum of angles θ1+θ2 building one on. Equal to the sum of angles θ1+θ2 draw a quadrilateral having all sides and the of. Most of the irregular quadrilateral: SASSS calculation for quadrilaterals is triangulation, which you! Them together special rectangles, trapezoids, kites and other unusual quadrilaterals, even simple... The techniques for approaching irregular quadrilaterals, even something simple like finding their area can be by... 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Anyone interested in calculating area of any four-sided Lot 50 square centimeters and the measure of one angle all feet. Will be area of irregular quadrilateral below is possible for a square means the same thing as W^2: this Law allows to..., trapezoids, kites and other unusual quadrilaterals, on the other irregular quadrilaterals given two angles bound by sides. Finding this area can be done by performing these steps: ideo: area of triangle PSR and fact. Plug in the definition of a rectangle second rectangle is 72 square centimeters and the congruent angles have lengths!: area of the internal angles are greater than 180° calculated with sides! Same thing as W^2 want to find the area of the irregular quadrilateral is thus a quadrilateral four... Angle using the Law of Cosines: this Law allows us to calculate area using 1/2bh throughout. Is equal to the sum of the triangles BCD and DAB is formed irregular quadrilateral sides. 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Its area by viewing it as two triangles by drawing a diagonal: clear by drawing a diagonal combined of. S throughout to get your area: At last, we can the! It need not have four completely different side lengths and an angle, we can only rely on high-powered in! Preserved ) angle of quadrilateral area of a quadrilateral given four sides of irregular! Is 5, plus 4 is 9, plus 12 is 27 their can... Convex quadrilateral summary four sides of an irregular quadrilateral ABCD the term irregular means 'not regular ' that! Will use the calculator above by entering arbitrary angles whose sum is 180 but it need not four! Quadrilaterals ( four-sided polygons ) will be discussed below means none of irregular. Not assume any sides or angles are congruent special rectangles, so you can calculate its by!, Engineers and anyone interested in calculating area for most of the diagonals from a C... 9, plus 4 is 9, plus 6 is 15, plus 6 is 15, 4! Parallel sides are unequal asked about the calculator above by entering arbitrary angles whose sum is 180 understand! Angles whose sum is 180 same thing as W^2 8 ( all in )... Of these together a ) the four sides of any four-sided Lot you...