The rectangle has a perimeter of 288cm and its length is 3 times its width. Calculate the sides of the rectangle.

Let us determine by making an equation what the sides of the rectangle are equal to, provided that one is 3 times larger than the other, and the perimeter is 288 cm.

Let’s remember the formula for calculating the sum of all sides of such a figure:

P = 2a + 2b.

Hence:

2x + 2 * (3x) = 288.

Let’s perform actions with the coefficients of the variable on the left side of the equation:

8x = 288.

To find the second factor, divide the product by the first:

x = 288: 8 = 36.

Therefore, width = 36 cm, and length = 3 * 36 = 108 cm.