The easiest method to find an area of a shape, particularly if it is a simple shape made up of straight lines, is to count the squares inside it.
Work out the area (in square units) of each of the shapes on the left then click on the button marked to see whether you are correct.
Estimate the area of the shape. Some of the squares have been numbered to help you.
There are 4 complete squares (labelled 1, 2, 3 and 4). Regions 5 and 6 together make up about 1½ squares, as do regions 7 and 8. So we have another 3 squares giving a total of 7 square units (plus a little bit more!).
We often have to use this type of estimation when working with curved shapes.
Look at the circle below. Count squares to estimate its area.
Find the areas of these shapes by counting squares.