![]() Thats a lot of different formulas for the length of a rectangle These are all derived from the many formulas that govern a rectangles dimensions. If the rectangles width is not known, youd need to simultaneously solve the system of equations above to get the length h. You can use the hypotenuse formula, e.g., from the Pythagorean theorem calculator, to estimate the diagonal of a rectangle, which can be expressed with the following formula: d l + w, and now you should know how to find the diagonal of a rectangle explicit formula - just take a square root: d (l + w). For any other similar values, use this rectangle calculator to verify the results. If you have the diagonal d and width w, its length is h (d²w²). By click on the corresponding problem shows the step-by-step calculation or work with steps for how to find the area, perimeter, diagonal, length or side of a rectangle. Diagonal of a rectangle ( l2 + w2) Solved Examples on Rectangle Calculator Example1: Find the area of a rectangle whose side length is 7 units and whose width is 6 units. We can use Pythagoras' Theorem to find the length of the diagonal if we know the width and height of the rectangle. The diagonal of the rectangle is the hypotenuse of these triangles. Below are the practice problems for grade school students, on finding what is the area, perimeter, diagonal, length or width of a rectangle. Problem 1: Calculate the diagonal line of the rectangle if the larger side of the rectangle is. As you can see, a diagonal of a rectangle divides it into two right triangles, BCD and DAB. ![]()
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