A [non-intersecting] closed curve
a ray
circle
A circle for example.
a line orOuroboros the snakes that eats it self
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 closed figure, like a circle or triangle, begins and ends at the same point.
THE SIGN OF THE CROSS
it is a ray
segment
A segment.
circle
a ray
circle
A circle for example.
Center (origin) Circumference