The BC side of the ABCD parallelogram is 12 m, which is 30% of its perimeter. Find the other sides of the parallelogram.

In order to find the second side of the parallelogram, we must first of all find the perimeter of the rectangle. For this we will use the proportion.

We know that one side of the parallelogram is 12 meters, which is 30% of its perimeter.

Let’s mark the perimeter of the parallelogram as x meters and take it as 100%.

x – 100%;

12 – 30%.

Proportion:

x / 12 = 100/30;

x = (12 * 100) / 30 = 1200/30 = 40 meters perimeter.

P = 2 (a + b);

2 (12 + x) = 40;

12 + x = 40: 2;

12 + x = 20;

x = 20 – 12;

x = 8 meters length of the second side.