# Calculate the perimeter of a rectangle if its area is 140 cm2 and its length is 20 cm.

December 30, 2020 | education

| Decision:

The area of a rectangle is equal to the product of its length and width.

Knowing the area and length of the rectangle, we find the width of the rectangle: 140/20 = 7

7cm – rectangle width

The perimeter of a rectangle is equal to the sum of the lengths of all its sides. Knowing the width and length of the rectangle, we find its perimeter:

P = 20 * 2 + 7 * 2 = 40 + 14 = 54

54cm – rectangle perimeter

Answer: 54cm

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