In the figure above, an equilateral triangle is inscribed in a circle. If the arc bounded by adjacent corners of the tri

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circle.jpg
In the figure above, an equilateral triangle is inscribed in a circle. If the arc bounded by adjacent corners of the triangle is between \(4\pi\) and \(6\pi\) long, which of the following could be the diameter of the circle?

(A) 6.5
(B) 9
(C) 11.9
(D) 15
(E) 23.5

[spoiler]OA=D[/spoiler]

Source: Manhattan GMAT
Source: — Problem Solving |