Find the perimeter and area of a rectangle, one side of which is 18 cm and the other is 4 times larger than the first.

A rectangle has equal opposite sides. Let’s find its perimeter – the sum of all sides, and the area, provided that the length of one side is 18 cm, and the other is 4 times larger than the first.

First, let’s find the unknown side:

18 * 4 = 72 cm.

We calculate the perimeter by the formula:

P = 2 * (a + b) = 2 * (18 + 72) = 2 * 90 = 180 cm.

The area is:

S = a * b = 18 * 72 = 1296 cm².