The length of an arc is 7π. If the diameter of the circle is 14, what is the degree of central angle by that arc?

A 90°
B 120°
C 180°
D 270°

Correct Answer: 180°

We know that, s = rϴ                           ϴ =7π/7=π1 radian =180/π °π radian = 180°
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