An octagon is a polygon that has 8 sides
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The name of a regular polygon with five equal sides and five equal angles is a pentagon. Each of the internal angles is equal to 108 degrees.
Icosogon
360/18 ie 20 sides
it is usually called a heptagon or septagon. but we usually call it a heptagon. :)
It can be, if its sides all have the same length.In that case, it would also be called a 'square'.