A polygon with 8 sides is an octagon.
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A regular polygon with 8 sides is an octagon. Like a stop sign.
Octagon.
An octagon is a polygon with eight sides.
A polygon can have 8 sides but does not have to. The word "Polygon" is made up of two words: "poly-" and "-gon" which have Greek roots which mean "many" and "angle" respectively; literally a "polygon" is a "many angled shape". A polygon is any shape that has 3 or more sides. An 8 sided polygon is called an octagon (literally "eight angles").
This type of polygon is called a hexagon. "Hex-" is a greek root, meaning 6. A polygon is a geometric plane figure consisting of at least 3 straight sides and angles, such as a triangle or square. Because "hex-" means 6, you know that a polygon that has 6 sides and 6 angles is a hexagon. As another example, "octo-" means 8, so a polygon that has 8 sides and 8 angles would be called an octagon.