A polygon is a 2 dimensional (flat) geometric figure with 3 or more sides. The computer screen you are looking at right now is probably a polygon. So is the door to your room, a window, the mattress on your bed, etc
Polygons are closed plane figures with straight line edges and several sides. For example triangles, rectangles, squares, pentagons, and hexagons.
Remember!
Circles are not polygonal shapes!
Polygon comes from two Greek words:
A "Polygon" is a shape with many corners (angles).
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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.'
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.
A polygon can be equilateral but not always equiangular. Some examples of this are rhomboids and other polygons like pentagons and hexagons.
There is an infinite amount of polygons.