Each side of the square was reduced by 10%. How has its perimeter changed?

univerkov | June 10, 2021 | education

Let the side of the square be equal to a. The perimeter of the square is P = 4a.
Reducing the side of the square by 10%, we get 0.9a.
So the perimeter is P = 4 * 0.9a = 3.6a
hence the perimeter 3.6 / 4 = 90 percent means the perimeter has decreased by 10%.
Answer: the perimeter will decrease by 10%

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