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In geometry, a vertex angle is the angle associated with a vertex of a polygon. Often a vertex angle of a polygon is referred to simply as an angle of the polygon. A vertex angle in a polygon is often measured on the interior side of the vertex. For any simple ''n''-gon, the sum of the interior angles is π(''n'' − 2) radians or 180(''n'' − 2) degrees. In higher-dimensional polyhedra and polytopes, a vertex angle is an angle formed by two edges of the polyhedron that both belong to a common two-dimensional face of the polyhedron. That is, it is a vertex angle of one of the polygons that form the polyhedron. == See also == * Complementary angles * Supplementary angles * Dihedral angle 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Vertex angle」の詳細全文を読む スポンサード リンク
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