One of the sides of the rectangle = 10 cm, and its perimeter is 60 cm. Find the sides of the given rectangle.

In order to find the sides of a rectangle, we will recall the properties of the sides of a rectangle and the formula for finding the perimeter of a rectangle.

So, from the condition it is known that one of the sides of the rectangle is 10 cm, and its perimeter is 60 cm.

The opposite sides of the rectangle are equal to each other. That is, the length of one pair of sides is known to us 10 cm.

Let’s denote by x cm the length of the second side.

P = 2 (a + b);

2 (10 + x) = 60;

10 + x = 60: 2;

10 + x = 30;

x = 30 – 10;

x = 20 cm the length of the second pair of sides of the rectangle.