A closed curve. This includes shapes made of straight-line segments.
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.
begins and ends at the same point
my guess would be the circle; but that continues on and on maybe a point all by itself
A segment.
segment
it is a ray
That's called a closed figure.That's called a closed figure.That's called a closed figure.That's called a closed figure.
circle
circle
a ray