a triangle-3
a quadrilateral or square-4
a pentagon-5
a hexagon-6
a heptagon-7
a octagon-8
a nonagon or ennagon-9
a decagon-10
a hendecagon or undecagon-11
a dodecagon-12
a triskaidecagon-13
a tetrakaidecagon-14
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Tessellations
Some examples of polygons include circles, triangles, squares, rectangles, pentagons, and hexagons. These are examples of 'simple polygons,' in that none of the lines overlap and intersect each other, such as in a pentagram, which is a 'star polygon.'
They are known as regular polygons.
Most regular polygons will not - by themselves. In fact, of the regular polygons, only a triangle, square and hexagon will. No other regular polygon will create a regular tessellation.
A polygon is a two-dimensional shape enclosed by lines only, not curves. So triangles, squares, rectangles, and octagons are examples of polygons. Circles, ellipses, and annuli are some shapes that are not polygons.