GCSE Perimeter and area - WJEC Area of composite shapes Knowing how to find the perimeter or area of a shape can be useful in everyday life - from wrapping a present to buying a carpet.

To calculate the perimeter of a shape, like this window, you can add the length of all the sides together. 100cm + 120cm + 100cm +120cm = 440cm Or, you can multiply the length and width by 2. You ...