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# Area of a Rectangle by the length of one side and the diagonal

This online calculator finds the area of a rectangle from the length of one side and the diagonal.

Rectangle is a quadrilateral having opposing sides parallel and four right angles. To find the area of a rectangle you should multiply its length by its width. The equation is
$A = L * W$

However, you may know only the length of one side and the diagonal. It this case you first should use the Pythagorean theorem to find the another side. If a and b are the sides, and d is the diagonal, the Pythagorean theorem states that
$d^2=a^2+b^2$

From there
$b=\sqrt{d^2-a^2}$

and the final formula for the area of a rectangle is
$A=a \cdot \sqrt{d^2-a^2}$

#### Area of a Rectangle by the length of one side and the diagonal

Digits after the decimal point: 2
Length of another side

Area

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PLANETCALC, Area of a Rectangle by the length of one side and the diagonal