As shown in the figure, the circle has radius r, which is the inscribed circle of an equilateral triangle. What is the length of the side of the equilateral triangle？（represented by r）
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数学PS
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As shown in the figure, the circle has radius r, which is the inscribed circle of an equilateral triangle. What is the length of the side of the equilateral triangle？（represented by r）
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正确答案: A