Diagonal of a Rectangle |

Free online Diagonal of a rectangle calculator – Enter the length and width of the rectangle with different length units then click the calculate button.

## The diagonal of a rectangle

The diagonal of a rectangle is a line segment that connects two opposite corners or vertices of the rectangle.

A diagonal is a measure from a vertex to the opposite side, passing through the opposite corner.

## Diagonal of Rectangle formula

The formula for calculating the diagonal (d) of a rectangle

**d = √(a²+b²)**

- d = Diagonal of a rectangle
- a = width of a rectangle
- b = Length of a rectangle

## How to calculate the diagonal of a rectangle?

Here’s a step-by-step guide:

- First, Determine the length of a rectangle
- Next, Determine the width of a rectangle
- Next, Square each of the side lengths: a² and b²
- Next, Add the squared values together: a²+b²
- finally, Take the square root of the sum to find the length of the diagonal:d = √(a²+b²)

## Solved Example.

**Example. 1:** The length of the rectangle is 30 metres and the breadth is 40 metres then find the diagonal of the rectangle.

Given values, length = 30 mt, breadth = 40 mt

Diagonal of a rectangle = √(length² + breadth²) = √(40² + 30²) = 50 metres

**Example. 2**: The length of the rectangle is 20 metres and the breadth is 70 metres then find the diagonal of the rectangle.

Diagonal of a rectangle = √(length² + breadth²) = √(20² + 70²) = 72.801 metres