# Concave and Convex Polygons

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A convex polygon is a polygon in which every angle is less than 180°.
A concave polygon is a polygon in which at least one angle is more than 180°.
A diagonal is a line segment connecting two non-consecutive vertices of a polygon.
If all the diagonals of a polygon lie inside the polygon, then it is a convex polygon.
If all the diagonals of a polygon do not lie inside the polygon, then it is a concave polygon.
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