Mathematics for IGCSE & O level - Mensuration (Section 3 - No. 13)
How do you calculate the area of a compound shape made up of simpler shapes, for example rectangles and triangles?
Add the areas of each shape
Multiply the perimeter of each shape
Subtract the areas of the shapes
Divide the perimeter by the number of shapes
Explication
The total area of a compound shape is obtained by summing the areas of its individual components.