Calculate the perimeter of a rectangle if its area is 140 cm and its length is 20 cm.

univerkov | June 17, 2021 | education

First, find the width of the rectangle, divide its area, which is 140 cm², by the length, which is 20 cm.

b = 140 cm² ÷ 20 cm = 7 cm.

Then we calculate the perimeter of the rectangle, multiply by 2 the sum of the length and width of the rectangle.

P = (20 cm + 7 cm) * 2 = 54 cm.

Answer: The perimeter of the rectangle is 54 cm.

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