Answer:
11.15
Explanation:
Formula
C = 2 * pi * r
C is the circumference
pi is 3.14 and is associated with all circles
r is the radius (which you are seeking).
Givens
C = 70 inches
pi = 3.14
r = ?
Solution
C = 2*pi *r Substitute the givens into the formula
70 = 2* 3.14 * r Combine the right
70 = 6.28 * r Divide both sides by 6.28
70/6.28 = 6.28 * r / 6.28
11.15 = r