Polygon

Any shape made of straight edges/sides – many sides

Poly = many

Poly means many in mathematics

Polly the parrots were many and everywhere.

Gon in mathematics means sides

Gone are the sideburns he’d had for years.

Example 1

All the above are examples of polygons.

Example 2

A concave and convex shape is still a polygon, as long as the sides are straight and there are corners.

Polygons can be convex or concave.

Example 3

Polygons where all the sides are equal length are known as equilateral polygons.

Example 4

Polygons where all the internal angles are equal are known as equiangular polygons.