A ray.
That, my friend, is called a ray. A segment is when a line has two definite endpoints, so it can't be that. And a line has no endpoints, so that is not it either. The ray, as you specified in your question, has one endpoint, and extends forever in one direction. Hope this has been of help. :)
It is season 6 episode 4 and it's called iGo one direction
One Direction
In One Direction
who is one direction's sponsor
it's a plane
Space.---------You could argue that a plane extends indefinitely in any direction, but those directions must be within the plane.
true
A ray in geometry is a line with a single endpoint and extends indefinitely in one specified direction.
It is a plane that extends indefinitely in all directions. It is very easy to remember just think about what flys in the air and needs to land on a "flat surface that extends indefinitely in all directions" (the ground).
ray
A ray.
a ray
A plane =)
A plane
Two, as it is a line.
Plane