Question

This rectangle has a perimeter of 120
centimeters. If the width is 20 cm, what is
measure of the length?
20 cm
x cm

Answer 1

Answer:

the measure of the length is 40cm.

Step-by-step explanation:

Formula: P=2L+2W

so 120=2L+2(20)

we want the subject to be L

so 2L=120-40,because 2×20 is 40

and when you sending across the sign will change.

so 2L=80,than we divide both side by 2.

So 80÷2=40,

therefore the answer is 40.