It's probably a circle, because some people view it as a 0 sided figure, but some people view it as a 1 sided figure.
a semi-circle
A 10 sided polygon is a decagon
Pentagram
Pretty damned close to a circle.
A circle cannot have 10 sides, it has only one, uniformly curved side.
a circle
Circle
It's probably a circle, because some people view it as a 0 sided figure, but some people view it as a 1 sided figure.
There is no such thing as a 1 sided shape nor a two sided shape.
A 9-sided "circle" is an nonagon or enneagon.
a polygon is a multi-sided shape, therefore a circle is not a polygon.
circle
a circle
A circle!
circle
a circle