A perspective vanishing point on the horizon
a half-line with a designated end point which extends in only one direction without stopping
This is called a ray.
The line, itself, is a subset (though not a proper subset). A ray is a subset of a line with one end-point which extends in only one direction. A line segment is a subset of a line with two end points. A point is a subset of a line.
A ray can be described as the half line with designated end point which extends in only one direction without stopping.
One-point perspective has only one vanishing point.
A ray has only one end point.
No, it has two. A ray has one end point.
ray
yes. only one
the part with the end point does not, it stops at the end point. But if there is only one end point on a line, the other end does go on forever
a half-line with a designated end point which extends in only one direction without stopping
No as it has only one end point.
linear?
The end would be called a point or an endpoint. It only has one end since it is infinite in the other direction.
Since a Line has only one dimention LENGTH, the only way to identify a point on it is to measure its distance from a known point ... usually on end or the other.
The radius
It is a ray.