An octagon and a quadrilateral, respectively.
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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").
An octagon.octagon
The measure of 1 exterior angle of a regular 8-sided polygon is equivalent to 45 degrees. Hope I helped! :)
A 28-sided shape is called an icosikaioctagon. The prefix "icosi" denotes 20 sides, and the suffix "-octagon" denotes 8 sides, combining to form the name for this polygon. It is a type of polygon known as a polygon with 28 sides.
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