# The area of the rectangle is 63 cm2. Find its perimeter if one side is 7 cm long.

December 29, 2020 | education

| To solve this problem, we use the formula for finding the area of a rectangle.

S = ab;

S = 63 cm ^ 2;

a = 7 cm;

The length of the second side is denoted by x cm.

b = x cm;

Using these expressions, we substitute them into the formula for the area.

63 = 7 * x;

To find an unknown factor, the product must be divided by a known factor.

X = 63: 7;

X = 9;

b = 9 (cm);

Find the perimeter of the rectangle using the formula:

P = 2 (a + b);

P = 2 (7 + 9) = 2 * 16 = 32 (cm);

Answer: The perimeter of this rectangle is 32 centimeters.

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