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In this tutorial we will learn to calculate the approximate area of a given irregular
figure using a square grid paper. Calculate the area of given the irregular
figure. Take area of one square to be 1 sq. cm.
Step 1 Count the complete square as 1. Let us color
the complete squares orange. Number of complete squares is equal to 18
Step 2 Count the square which are exactly covered
half as 1/2. Color the half squares green. Number of half -filled squares is equal to
4 Step 3
Count the square which is covered more than half as 1
Color these squares as yellow. Number of more than half - filled squares
is equal to 7 Step 4
Ignore the squares that are covered less than half.
Area of 18 complete squares = 18 x 1 sq. cm = 18 sq. cm.
Area of 4 half filled squares = 4 x 1/2 sq. = 2 sq. cm.
Area of 7 more half - filled squares = 7 x 1 sq. cm= 7 sq. cm.
Therefore, area of irregular figure = (18+2+7) sq. cm = 27 sq. cm (approx.)