The area of a rectangle is 56 cm 2. What is the perimeter of this rectangle if its length is 8 cm?


The area S of the rectangle is 56 cm2.

The length a of this quadrangle is 8 centimeters.

We calculate the width of this figure by the formula b = S: a:

b = S: a = 56: 8 = 7 centimeters.

The perimeter of the quadrilateral is calculated by the formula P = a + a + b + b:

P = a + a + b + b = 8 + 8 + 7 + 7 = 30 centimeters.

Answer: The perimeter of the rectangle is 30 centimeters.

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