The perimeter of the rectangle is 56 cm, and one of the sides is 7 cm. Find the second side and area of the rectangle.

Find the sum of the sides (length and width) of the rectangle.

To do this, divide its perimeter by 2, since the opposite sides of the rectangle are equal to each other.

We get:

56/2 = 28 cm.

Let’s find the second side.

To do this, subtract the known side from the sum of the length and width.

Will be:

28 – 7 = 21 cm.

Find the area of the rectangle.

To do this, we multiply its length by width.

Will be:

21 * 7 = 147 cm2

Answer: The length of the second side is 21 cm, the area of the rectangle is 147 cm2