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In the figure below, what is the value of x?
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解析：
根据图示可知，三角形的两边为圆的半径，是等腰三角形，所以有180=72+2x→x=54.
根据图示可知，三角形的两边为圆的半径，是等腰三角形，所以有180=72+2x→x=54.
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