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how many sides does a regular polygon have if each interior angle measures 60°?
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Step1: 多边形内角和公式
多边形内角和公式为\((n - 2)\times180^{\circ}\)(\(n\)为边数,\(n\geqslant3\)且\(n\)为整数)。
Step2: 列方程求解
已知正多边形每个内角为\(60^{\circ}\),设边数为\(n\),则内角和为\(60n^{\circ}\)。根据内角和公式可得方程\((n - 2)\times180 = 60n\)。
展开括号:\(180n-360 = 60n\)。
移项:\(180n - 60n=360\)。
合并同类项:\(120n = 360\)。
解得:\(n = 3\)。
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\(3\)