You need to 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
On to the questions!