# The area of the rectangle is 630 cm2. find the sum of the lengths of its sides if the length of the rectangle is 90 cm.

August 22, 2021 | education

| We know that the area of a rectangle is 630 cm ^ 2. You need to find the sum of the lengths of its sides if the length of the rectangle is 90 cm.

Let’s remember the formula for finding the area of a rectangle.

S = a * b, where a and b are the length and width of the rectangle, respectively.

Substitute the known values into the formula and solve the resulting linear equation in one variable.

90 * b = 630;

b = 630: 90;

b = 7 cm width of the rectangle.

Let’s remember the formula for finding the perimeter of a rectangle:

P = 2 (a + b) = 2 (90 + 7) = 2 * 97 = 194 cm.

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