The length of the rectangle is 9 cm and the width is 1/3 of the length, we calculated the perimeter and area of this rectangle.

In order to find the part of an integer value, you must divide it by the denominator of the fraction and multiply by its numerator.

Find the width of the rectangle, provided that it is 1/3 of its length, which is 9 cm:

9: 3 * 1 = 3 cm.

The perimeter of such a figure is determined by the formula:

P = 2a + 2b. Substitute the known values and get:

P = 2 * 9 + 2 * 3 = 18 + 6 = 24 cm.

The area of the rectangle is calculated by the formula:

S = a * b = 9 * 3 = 27 cm².