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Question
Explain how you will measure the area of (i) a square (ii) a leaf?
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Solution
The area of a square can be calculated by using the following formula:
i. Area of square of side l
= side x side
= l × l = L2.
ii. The area of a leaf is obtained by using a graph paper. A graph paper has small squares of each side 1 mm. The area of each big square is 1 cm2.
Procedure: Place the leaf on graph paper. Draw its outline on the paper and remove it. Now count the number of complete squares. To this add the number of incomplete squares which are half or more than half. Ignore the squares which are less than half. Thus,
Approximate area = (No. of complete squares + no. of half or more than half of incomplete squares) × area of one square.
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