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
In mathematics, a ray is defined as a part of a line that has one endpoint and extends indefinitely in one direction. It is represented by a single point and an arrow indicating the direction of the line.
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
In mathematics, a ray is a well-defined concept. A ray has one endpoint and extends indefinitely in one direction. So, a ray is not considered an undefined term in mathematics.
A ray.
Ray AB: Starts at point A, extends indefinitely through point B. Ray CD: Starts at point C, extends indefinitely through point D. Ray EF: Starts at point E, extends indefinitely through point F.
a ray
A plane =)