Vertex angle

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In geometry, a vertex angle is the angle associated with a vertex of a polytope.

[edit] In a polygon

The vertex angle (denoted by α₁ or A₁) in a polygon is measured by 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.^[1]

[edit] See also

• Complementary angles
• Supplementary angles
• Central angle
• Inscribed angle

[edit] References