Answer and Explanation
Your Answer is
Correct Answer is J
Explanation
The circumference of the circle is 4π×5, or 20π, so the diameter of the circle is 20 and the radius is 10. Choose J.
54. The length of arc 
of a circle is equal to 
of the circumference of the circle. The length of the arc is 4π inches. What is the radius, in inches, of the circle?