Interior and Exterior Angles of a Polygon

Mathematics — Second Preparatory

A polygon and its angles

A polygon is a closed flat figure made of straight segments called sides, where each two consecutive sides meet at a vertex.
A regular polygon has all its sides equal and all its angles equal, such as a square or an equilateral triangle.
An interior angle of a polygon is the angle between two consecutive sides, measured inside the polygon.
An exterior angle is the angle between a side and the extension of the neighbouring side.
At each vertex, the exterior angle and the interior angle are supplementary.

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