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question
how many sides does a polygon have if the sum of the interior angles is 2340°?
answer attempt 1 out of 2
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Step1: 多边形内角和公式
多边形内角和公式为\((n - 2)\times180^{\circ}\)(\(n\)为边数且\(n\geqslant 3\)且\(n\)为整数)。
Step2: 代入求解
已知内角和为\(2340^{\circ}\),则\((n - 2)\times180^{\circ}=2340^{\circ}\),
先计算\(n - 2=\frac{2340^{\circ}}{180^{\circ}} = 13\),
再计算\(n=13 + 2=15\)。
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