Center (origin) Circumference
A circle perhaps?
if a decimal point is allowed, .214563 or 2.14563 if not 214563
A line segment is a straight line that has endpoints.
If it ever ends, then it is.If there are no digits after the decimal point, it's an integer.
A closed figure, like a circle or triangle, begins and ends at the same point.
A circle for example.
polygon I think I would say, it is a circle.
my guess would be the circle; but that continues on and on maybe a point all by itself
begins and ends at the same point
A closed curve. This includes shapes made of straight-line segments.
A segment.
it is a ray
segment
circle
a ray
circle