# 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.

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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