Perimeter of a Rectangle

Example 1: 

The length of a rectangular room is 8m, and the width (breadth) is 6m. Find the perimeter of the room.

Solution:

Length of the room, L = 8m

Width of the room, W = 6m

Perimeter  =  2 (L  +   W)

Perimeter =  2(8  +  6)

= 2  ×  14

= 28m 

Example 2:

A rectangle is 5m long and 2000mm wide. Find the perimeter.

Solution:

First, convert to the same unit, so we will convert millimetre to metre. Remember there are 1000 millimetres in 1 metre. 

Width (w)   =   2000mm

= 2000 ÷ 1000

= \( \frac{2000}{1000} \)

Width = 2m

Length (l) = 5m

Perimeter  = 2 (L  + W)

= 2 × (5  +  2)

= 2  ×  7

Perimeter = 14m