An octagon is a polygon that has 8 sides
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.
how many sides does an polygonshave
A pentagon
A polygon with ten sides would be called a decagon.
That might be a figure as simple as a triangle, as long as it is no special triangle (that is, a triangle with sides of three different lengths).
Icosogon
Heptagon
It is a triangle
there is such a thing as an irregular polygon that has sides of different sizes. all REGULAR polygons however have equal sides
360/18 ie 20 sides
A polygon is a closed 2-D shape with sides made from straight line segments.