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An equilateral triangle of side 6 cm is inscribed in a circle. Then radius of the circle is:

An equilateral triangle of side 6 cm is inscribed in a circle. Then radius of the circle is: Correct Answer $$2\sqrt 3 $$  cm

$$\eqalign{ & R = \frac{a}{{\sqrt 3 }} \cr & R = \frac{6}{{\sqrt 3 }} \cr & R = 2\sqrt 3 \,{\text{cm}} \cr} $$

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