Calculate the perimeter of a rectangle if its length is 2 times its width and width is 2 cm.

Let’s find the length of the rectangle. To do this, we will increase the width by 2 times:

2 cm * 2 = 4 cm;

We calculate the perimeter of the rectangle using the formula:

P = 2 * (a + b), where a is the width of the rectangle, b is the length of the rectangle;

P = 2 * (2 + 4) = 2 * 6 = 12 cm.

Answer: the perimeter of the rectangle is 12 cm.