What is the perimeter of a rhombus if 1 side is 20 cm what is the side of a rhombus if its perimeter is 20 cm?

Since the lengths of all sides of a rhombus are equal, the perimeter of any rhombus is equal to the length of the side of this rhombus multiplied by 4.

Therefore, the side length of any rhombus is equal to the perimeter of this rhombus divided by 4.

If the length of the side a of a rhombus is 20 cm, then the perimeter P of such a rhombus is:

P = 4 * a = 4 * 20 = 80 cm.

If the perimeter P of a rhombus is 20 cm, then the length of side a of such a rhombus is:

a = P / 4 = 20/4 = 20 cm.

Answer: the perimeter of the rhombus is 80 cm, the length of the side of the rhombus is 20 cm.