Internal and External Angle

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High Quality Content by WIKIPEDIA articles! In geometry, an interior angle (or internal angle) is an angle formed by two sides of ...

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High Quality Content by WIKIPEDIA articles! In geometry, an interior angle (or internal angle) is an angle formed by two sides of a simple polygon that share an endpoint in. This angle must be an angle on the inner side of the polygon to be an internal angle. A simple polygon has exactly one internal angle per vertex. If every internal angle of a polygon is less than 180°, the polygon is called convex.