Question

Sally needs to find the circumference of a circle with a diameter of 20 inches. She uses a calculator to find the circumference. Which answer is

reasonable?
A. 60.133574 in
B. 70.893927 in
C. 62.831185 in
D. 65.531319 in

Answer 1

Circumference = pi*diameter

C = pi*20

C = 20pi

When I used my calculator to compute 20*pi, I get approximately 62.83185

This is somewhat close to what choice C is saying. The difference is that choice C has an extra 1 buried inside it. I'm not sure if your teacher made a typo.

Answer 2

C

Circumference of a circle: C = 2πr π = 3.14 r = 20/2= 10
C = 2*3.14*10
6.28*10= 62.8

Hope that helps!