# Rectangular Area Calculator

The Rectangular Area Calculator computes the area of a rectangle based on two inputs: one side length and the length of the diagonal.

### This page exists due to the efforts of the following people:

#### Timur

Created: 2019-09-17 09:22:07, Last updated: 2023-02-07 21:58:04

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
$A = L * W$

However, you may know only the length of one side and the diagonal. Using the Pythagorean theorem, the calculator determines the length of the other side and then calculates the area by multiplying the two side lengths. 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

URL copied to clipboard
PLANETCALC, Rectangular Area Calculator