POLYGONS A simple closed curve made up of line segments only is called a polygon. DIAGONAL
A diagonal is a line segment connecting two nonconsecutive vertices of a polygon. CONVEX POLYGONS Polygons which have no portion of their diagonals in their exteriors are called convex polygons. CONCAVE POLYGONS Polygons which have some portion of their diagonals in their exteriors are called concave polygons. QUADRILATERALS 1. Parallelogram
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