The length of the rectangle is 12 cm and the width is 2 times less. Find the perimeter of the rectangle.

The length of the rectangle is 12 cm, and the width is 2 times less. Find the perimeter of the rectangle.

Find the perimeter of the rectangle
Let’s write the formula for the perimeter of a rectangle:

P = 2 * (a + b), where a and b are the sides of the rectangle.

Since the width of the rectangle is 2 times less than the length of the rectangle, in order to find the width of the rectangle, you need to divide the length of the rectangle 12 cm by 2. That is, we get:

12 cm / 4 = 3 cm.

From this we got that a = 12 cm, b = 3 cm.

In order to find the perimeter of a rectangle, you need to substitute the known values ​​into the formula for the perimeter of a rectangle and calculate its value. That is, we get:

P = 2 * (12 cm + 3 cm).

Find the value of the expression 2 * (12 + 3) by actions
First, in order of turn, we find the value of the expression in parentheses, then we calculate the multiplication or division, then the addition or subtraction actions are performed. That is, we get:

The first action is 12 + 3 = 15, then the expression becomes 2 * 15;
Second action 2 * 15 = 30;
As a result, we got 2 * (12 + 3) = 30.
From this we got that the perimeter of the rectangle is P = 30 cm.