The perimeter of a rectangle is 40 cm. If its breadth is 8 cm, then what is the difference between the length and breadth of this rectangle?

4 cm

The perimeter of a rectangle = 40 cm.

 If its breadth is 8 cm.

We know that,

Perimeter of a rectangle = 2(length + breadth)

Let the length of the rectangle be l.

Perimeter of the rectangle = 2(8 + l) = 40

l = 20 - 8 = 12 cm