If \(O\) is the center of the circle above, what fraction of the circular region is shaded?

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Circle.png
If \(O\) is the center of the circle above, what fraction of the circular region is shaded?

(A) \(\dfrac1{12}\)

(B) \(\dfrac19\)

(C) \(\dfrac16\)

(D) \(\dfrac14\)

(E) \(\dfrac13\)

Answer: C

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