The image above is a rectangle with a length of 8 cm and a width of 5 cm.

To compute the perimeter of a rectangle requires two parameters which are the **length of the rectangle** and the **width of the rectangle**.

The formula for calculating the perimeter of a rectangle is:

P = 2 (l + w)

Where:

P = Perimeter of a Rectangle

l = Length of a Rectangle

w = Width of a Rectangle

Let’s solve an example:

Find the perimeter of a rectangle where the length of the rectangle is 8 cm and the width of the rectangle is 5 cm.

This implies that:

l = Length of the Rectangle = 8 cm

w = Width of the Rectangle = 5 cm

P = 2 (l + w)

P = 2 (8 + 5)

P = 2 (13)

P = 26

Therefore, the **perimeter of the rectangle** is **26 cm**.

**How to Calculate the Length of a Rectangle when the Perimeter of the Rectangle and the Width of the Rectangle is Given**

l = ^{P} / _{2} – w

Where:

l = Length of the Rectangle

P = Perimeter of the Rectangle

w = Width of the Rectangle