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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Decagon. A decagon is the name of a ten sided shape.
A 10-sided shape is a decagon.
A Pentacontagon is a fifty sided shape ...
hundred sided shape is called a chlligon
A 70 sided shape is called a heptacontagon.