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well a polygon has angles and a curve has none.
Quadrilateral has four sides and a polygon has 4 equal sides
Any polygon that has an angle that is > 180º is a concave polygon. A convex polygon does not. e.g. All regular polygons are convex.
Regular polygon is equilateral and equiangular. Irregular polygon is non-equilateral and non-equiangular.
a polygon is a connected line pretty much a shape is like a triangle