Question

A rectangle has a perimeter of 84cm and a length of 35cm.
what is the width

Answer 1

This is so so so so easy. Simply subtract the length times 2 from the perimeter and divide by 2.

Your answer is 7 cm

Answer 2

width = 7 cm

Explanation:

length = 35 cm

Perimeter = 84 cm

2 * ( l + b) = 84

2 * ( 35 +b ) = 84

35 +b = 84 / 2

35 + b = 42

b = 42 -35

b = 7

width = 7 cm