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-gon.Think about the name in the applet before pressing ⬆️ and ⬇️ to increase or decrease the number of sides.

Polygons can be classified according to their side lengths. Whenever all sides of a polygon are the same length, it is said to be a regular polygon. Otherwise, a polygon is considered to be irregular.

Additionally, depending on the shape, a polygon can be convex or concave. This last classification is based on the measure of the interior angles of the polygon.