The correct answer is C
Explanation
Choice (C) is correct. Since △ABO is equilateral, each of its angles has measure 60°. It follows that ∠BOC has measure 120°. Since and
are radii of the same circle, they are of equal length, and so △OCB is isosceles. Hence ∠OBC and ∠OCB each have measure 30°. Thus ∠ABC has measure 60° + 30° = 90°, and so △ABC is a 30°-60°-90° right triangle. Since
, the side opposite the 30° angle in △ABC, is of length 6, it follows that
, the side opposite the 60° angle, is of length
.
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