The length of the rectangle is unknown, but it is known to be twice its width.

The length of the rectangle is unknown, but it is known to be twice its width. Find the width if the perimeter is 36 cm and the perimeter is 72 cm2.

1) Let’s find out what width a given rectangle has, if we know that its length is 2 times more, and the perimeter is 36 cm.We make an equation where:

X – width;

2X – length;

36 – perimeter;

2 * (X + 2X) = 36;

2X + 4X = 36;

6X = 36;

X = 36/6;

X = 6 cm.

2) Determine how long this rectangle has if we know that its width is 2 times less and it is 6 cm.

6 * 2 = 12 cm.

Answer: the length of this rectangle is 12 cm, and its width is 6 cm.