Polygons are named after the number of sides which range upwards from 3 - without limit.
They may be regular (if all their sides are congruent AND all their angles are as well) or irregular.
They may be convex (a line joining any two points on the boundary of the polygon is wholly inside the boundary) or concave.
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The triangle is a polygon with 3 sides. The polygon is a closed planar geometric shape made of line segments connected end to end to end. All triangles are polygons, but not all polygons are triangles. There are many variations on the theme when it comes to a polygon. There are many, many different kinds.
A polygon is a shape that is a closed figure and has straight lines. example. A square