We made a rectangle from three identical squares. Find the perimeter of the rectangle

We made a rectangle from three identical squares. Find the perimeter of the rectangle if the perimeter of one square is 20 cm.

The perimeter of a square is determined by the formula:

P = 4 * a.

From this formula we get the side of the square.

20 = 4 * a.

a = 20/4.

a = 5 cm.

If you add a rectangle from three squares, then this rectangle will have a length 3 times its width.

Let’s find the width of this rectangle.

5 * 3 = 15 cm.

The perimeter of the rectangle is determined by this formula:

P = 2 * (a + b).

Find the perimeter of the rectangle.

P = 2 * (15 + 5) = 2 * 20 = 40 cm.

Answer: The perimeter of the rectangle is 40 cm.