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Question

Question 39

The perimeter of a rectangle becomes ___ times its original perimeter if its length and breadth are doubled.


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Solution

2 times

Perimeter of a rectangle with length l and breadth b, P=2(l+b)

If the length and the breadth are doubled, then the new length is 2l and the new breadth is 2b.

Therefore, the new perimeter is

=2[(2l+2b)]

=2[2(l+b)]

=2[P]

Hence, the perimeter becomes 2 times the original perimeter.


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