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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. This content is licensed under Creative Commons Attribution/Share-Alike License 3.0 (Unported). That means you may freely redistribute or modify this content under the same license conditions and must attribute the original author by placing a hyperlink from your site to this work https://planetcalc.com/8388/. Also, please do not modify any references to the original work (if any) contained in this content.

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

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

From there

and the final formula for the area of a rectangle is #### 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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