Question

If the circumference of parallelogram ABCD is 40 cm and AB = 12 cm, what is the length of each side of the parallelogram?​

Answer 1

Let measre of unknown side be x

Opposite sides of parellelogram are equal.

$AB + BC + CD + DA = 4012 + x + 12 + x =402x + 24 = 40x + 12 = 40/2 = 20x = 20-12 = 8.$

Measure of other side is 8 cm.