Calculate Areas and Perimeters of Rectangles

The perimeter is the total distance around a shape, starting and finishing at the same point.

 

Example

 

 

Here, the perimeter is 1 + 2 + 1 + 1 + 2 + 3 = 10 cm

 

 

The area of a rectangle is length x width.

 

Example

If we have a rectangle with a width of 4 m and a length of 6 m:

The area will be 4 m x 6 m = 24 m² 

 

 

Calculate a missing length 

If we know the area and one side, we can divide to find the length of the other side.

 

Example

A rectangular room has an area of 12 m²

If its length is 4 m, what is its width?

 

We divide 12 ÷ 4 = 3

So the width = 3 m

 

How do you feel about that one?

 

 

Let's have a go at some questions now.