# The area of the rectangle is 18 cm2. The width of the rectangle is 3 cm. find the perimeter of the rectangle.

March 31, 2021 | education

| Let a and b be the length and width of the rectangle. By the condition b = 3 cm.The area of the rectangle is determined by the formula

S = a * b,

whence its length is

a = S / b = 18/3 = 6 cm.

The perimeter of a rectangle is determined by the formula

P = 2 * (a + b) = 2 * (6 + 3) = 18 cm.