We need the area of the rectangle in column C from C3 to C11 ... the length and height in columns A and B as in the previous example. We need the areas of the triangles in column D from D3 ...

Save guides, add subjects and pick up where you left off with your BBC account. The total area of a compound shape is found by adding up the areas of the rectangles that have created the whole shape.

For example, to work in cm a 45 mm measurement ... The area of one triangle is equivalent to half of the area of the rectangle. The area of the rectangle is the length multiplied by the width.