Area of irregular figures
You can easily find the areas of regular figures by using formulae. But the problem arises in the case of irregular figures. Because, an irregular figure does not have any defined length, breadth, etc. We cannot, therefore, use any formulae to calculate its area. In such cases, we make use of graph papers having squares of side 1 cm each as shown in Figure. First, we draw the outline of the given figure of irregular shape on that graph paper. Then we count the number of complete squares in it and the number of incomplete squares. While counting the incomplete squares, we count only those squares that lie half or more within the figure; the other incomplete squares are neglected. The total number of squares thus counted gives the approximate area of the given irregular surface in cm².

In order to measure the areas of the irregular figures of very big size like field or playground, we split them into regular-shaped figures. Then the area of each figure is calculated and added to find the total area.