Diagonal of a Rectangle Formula

Know how to find the length of the diagonal of a rectangle using the diagonal of a rectangle formula mentioned below. Diagonal refers to the line segment that connects the two opposite corners or vertex of the rectangle. A rectangle has two diagonal and they are congruent, that is both will measure the same length. To find the diagonal, square the width and height of the rectangle and add the squared values. Then find the square root for it, the resultant value is the length of diagonal.


d = √ (w2 + h2)


d = Diagonal of Rectangle
w = Width
h = Height

Related Calculator:

As per Pythagorean theorem, you can find the diagonal of the rectangle just by knowing the side lengths. You can also use our calculator designed based on the diagonal of a rectangle formula, to find the diagonal of a rectangle with the known values of width and height.

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