No, lines are ongoing, and have no endpoint.
By definition a line has no endpoint as it can extend to negative and positive infinity. A ray has one endpoint and a segment has two endpoints.
The answer depends on what the endpoint is shared with!
It is a ray.
Such a line segment would be a radius of the circle.
It has two endpoints. A ray has one endpoint.
A line with a single endpoint going infinitely in another direction is a ray. The symbol for a ray is → . It is named for its endpoint and any other point located on it.
diameter
radius
2
The answer is a ray.
Not necessarily - it depends on the geometry. The equator, on a sphere like the earth, is a straight line on a spherical surface. It has no endpoint.