You must know the formula for finding the area of a rectangle.

Area of a rectangle = length × breadth

                               OR base × height

Example

Find the shaded area of the following shape.

Solution

Area of large square = 13 × 13 = 169 units²

Area of small square = 5 × 5 = 25 units²

Shaded area = 169 − 25 = 144 units²