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Question
Each side of a square is 7 m. If its each side be increased by 3 m, what will be the increase in its area.
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Solution
Each side of square = 7 m
∴ Area of square = (side)²= (7m)²
= 7m x 7m = 49m²
โต Side increased by 3 m
∴ Total length of side will be = 3 m + 7 m = 10m
∴ Area of square = (10 m)²= 10m x 10 m = 100 m²
∴ Increase in area = 100 m² – 49 m² = 51 m²
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