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Polygon = poly "many" gon "angle"

Polygon is a shape that is formed with straight lines that connects with each other. It has many sides or edges and many vertices or angles.

Types of polygon
1) regular - all sides and angles are equal
2) irregular - not all sides and angles are equal
3) convex - no internal angle is equal to 180° 
4) concave - has internal angle to is greater than 180°
5) simple - only has one boundary and does not cross over itself
6) complex - intersects with itself