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A circle is circumscribed about an equilateral triangle with side lengths of 9 units each. What is the area of the circle, in square units? Express your answer in terms of pi.

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InfaRed

  1. in an equilateral triangle, the altitudes are the medians.

    So, the radius of the circle is 2/3 of the length of each altitude.

    ...

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    Steve

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