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Verified Answer :

TheBlueFox

\(C = 2\pi r\\\\\frac{C}{2\pi } = \frac{2\pi r }{2\pi } \\\\\frac{C}{2\pi } = r\\\\\\\frac{66}{2\pi } = r\\\\21.01 = r\)

Therefore, the diameter of the circle is about 21.01 in.

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