Question

What is a reasonable estimate for the circumference of a circle with a radius of 12 inches? A. C≈36in. B. C≈72in. C. C≈144in. D. C≈432in.

Answer 1

B. C≈72in

Explanation:

Circumference = pi * d

Where d is the diameter

d = 2*radius

d =2 *12

d =24

C = pi*24

Let pi be approximated by 3.

C ≈ 3.*24

C ≈ 72