The area of the rectangle is 72 cm2 and one of its sides is 9 cm, find the second side and the perimeter of the rectangle.

In order to find the perimeter of a rectangle, we need to know the length and width of the rectangle.

From the condition, we know that the area of the rectangle is 72 cm2, and one of its sides is 9 cm.

In order to find the length of the second side, we will express the length of one of the sides from the formula for finding the area of a rectangle:

S = a * b;

a = S / b;

Substitute the known values and get:

a = 72/9 = 8 cm.

We know the length of the two sides, so we can move on to finding the perimeter of the rectangle.

P = 2 (a + b) = 2 (9 + 8) = 2 * 17 = 34 cm.