What is the exact circumference of a circle that has a radius of 10 cm? Select one: a. 10πcm b. 20πcm c. 100πcm d. 200πcm

b. 20πcm

Step-by-step explanation:

The circumference is given by

C = 2*pi*r

= 2 * pi * 10

= 20pi

Circumference Formula: C = 2πr

C = 2π (10)

C = 20π

The correct answer is b. 20πcm

Note that if you want to solve for the exact circumference, you don't want to solve for pi since its a non-terminating decimal. If you want to round the nearest circumference multiply pi with 3.14.

Best of Luck!