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In a certain 10-sided polygon,9 interior angles are congruent and the measure of the
remaining interior angle is 108 degrees.What is the measure of an exterior angle at the vertex of one of the congruent angles?(Note:An exterior angle at a vertex of a polygon is the angle between one side of the polygon and a line extended form an adjacent side of the polygon.)
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当前版本由 去没人的岛 更新于2024-04-07 11:32:42 感谢由 去没人的岛 对此题目的解答所做出的贡献。
10边形内角和是(10-2)*180゜，其中一个角是108゜，其他9个内角都相等，所以这些内角度数是[(10-2)*180゜-108゜]/9=148゜，外角就是180゜-148゜=32゜
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