The width of a rectangle is 8 cm less than its length. The perimeter of the rectangle is 52 cm.

What is the width of the rectangle?

7 cm

9 cm

15 cm

17 cm

1 answer

Perimeter of a rectangle is:

P=2l+2w
w=l-8
52=2l+2(l-8)
52=2l+2l-16
52=4l-16
4l=68
l=17

therefore
w=l-8,
w=17-8
w=9