A rectangle is also called as an equiangular quadrilateral, as all the angles of a rectangle are right angled. The property of a rectangle is that the length of the opposite sides must be equal. Ask Question Asked 5 years, 6 months ago. At first, let's write down three basic equations, for the area, perimeter and circumcircle radius: Area of a rectangle: A = w * l, Perimeter of a rectangle P = 2 * w + 2 * l, Circumcircle radius of a rectangle r = d/2. Diagonal of rectangle refers to the line segment or straight line that connect the opposite corner or vertex of the rectangle. To recall, a rectangle is a four sided polygon and the length of the opposite sides are equal. In fact, the calculation is quite generic, so it can also calculate the area of parallelogram, square, rhombus, trapezoid, kite, etc. Applying the diagonal formula for the area of the square (as obtained by the Pythagorean concept) we get the area equal to 50 square cms. Formula for Area of a Rectangle. Free practice questions for Basic Geometry - How to find the length of the diagonal of a rectangle. 144+144=c^2, 288=c^2, c=sqrt(288)=approximately 16.97. Calculate the width and height of a rectangle, given its diagonal and area. that is, the area of any convex quadrilateral. So, the area of the rectangle is 48 square ft. To get the area of any rectangle, we have to multiply its length and width. In order to prove this works, work out an area of a rectangle using that formula. ... Find width and length of rectangle given diagonal and area… Rectangle formulas include the formula for area, perimeter, and diagonal of a rectangle. Okay, I've found no formulas for this one online but I'm pretty sure that the area of a rectangle is calculable from its diagonal and ratio (quotient of its sides). Rectangle Formula. Use our online diagonal of a rectangle calculator to find diagonal of rectangle by entering the width and height. In this formula, a and b are the sides of the right triangle, and c is the long side or the hypotenuse. The formula for the area of a rectangle is length x breadth. A rectangle is a polygon that has four sides. Example 4 : If the length of each diagonal of a rectangle is 13 cm and its width is 12 cm, then find the area of the rectangle. Example 1 : Find the area of the rectangle figure shown below. According to the Pythagorean theorem, the diagonal value can be found knowing the side length. Asked in Geometry We can find the area of a rectangle by using the formula that includes height and width..