The rectangle is 9 cm wide, which is 3 cm less than its length. Find the perimeter and area of this rectangle.

First of all, we calculate what the length of the rectangle is, knowing that it is 3 cm more than the width, equal to 9 centimeters.

9 + 3 = 12 cm.

Let’s calculate what the area of a rectangle 12 cm long and 9 cm wide is equal to.

S = 12 * 9 = 108 cm².

Let’s calculate what the perimeter of the rectangle is.

P = 2 * (9 + 12) = 2 * 21 = 42 cm.

Answer: 42 cm; 108 cm².