Question

Martha measures the big prize wheel on a game show and calculates that it has a circumference of 12.56 yards. What is the prize wheel's radius?

Answer 1

The radius is 2 yards... 
Formula for circumference is $\pi r^2$ so divide your circumference by 3.14 or pi and you get 4 the square root of 4 is 2. 

Hope this helps!