Question

The formula for the circumference of a circle is C = 2\pi r, where r is the radius and C is the circumference. The equation solved for r is r = C/2\pi .

Find the radius of a circle that has a circumference of 16\pi .
A. r = 4
B. r = 8
C. r = 12
D. r = 16

Answer 1

What is the formula for the circumference of a circle?

C = pi r squared

C = 2 pi r

✔ C = 2 pi r squared

C = pi r cubed

A point travels halfway around a wheel with a radius of 1 foot. To the nearest foot, how many feet does it travel?

3 feet

Answer 2

B is the correct answer because the circumference of a circle is C = 2\pi r, where r is the radius should be 16/pi divided by 2/pi = 8