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Question

One side of a rectangle is 7 meters long and its area is 21 square meters. What will its perimeter be?

A
10 m
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B
56 m
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C
20 m
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D
42 m
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Solution

The correct option is B 56 m
Area =21 sq m
Area = length × width
21=7× width
So, we need to find the number which when multiplied by 7, gives 21.
Since7×3=21, we can say that the width of the rectangle is 3 m.
Let’s draw this rectangle.

Perimeter of the rectangle =7+3+7+3=20 m

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