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Question: What is a Concave Polygon ?

Answer:

A polygon is concave if part of it goes inwards. One of its interior angles is then a reflex angle (that is an angle between 180° and 360°). Concave polygons are sometimes called re-entrant. A concave polygon will always have an interior angle with a measure that is strictly greater than 180 degrees.

Example of a Concave Polygon: