The perimeter of the rectangle is 18 cm. The large side of the rectangle is 1/3 of its perimeter.

The perimeter of the rectangle is 18 cm. The large side of the rectangle is 1/3 of its perimeter. Find the smaller side of the rectangle.

To solve this problem, remember that the perimeter of a rectangle is the sum of the lengths of all its sides. Since in a rectangle the opposite sides are equal, then P = 2 * (a + b), where a is the length, b is the width. We calculate what the length is equal to, knowing that it is 1/3 of the perimeter, that is, from 18 cm. To find the part of the number, you need to multiply this number by the part.
a = 1/3 * 18 = 18/3 = 6 cm.
Let’s calculate what the width of this rectangle is equal to.
2 * (b + 6) = 18;
b + 6 = 18/2;
b + 6 = 9;
b = 9 – 6;
b = 3 cm.
Answer: 3 centimeters.