I am pretty sure that a ray is part of a line and has one endpoint. A ray starts at one point and continues infinitely out in one direction. A line continues infinitely in two directions. So, if you put a point on a line, then there would be one endpoint, and it would be part of a line. Either side of the point and the point itself together make a ray, just not both sides of the point.
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It's called a Ray.
A ray has one endpoint and continues indefinitely in one direction.
The line segment is a radius.
A ray begins at an endpoint and extends in only one direction.A half line does not include the endpoint.
The segment you describe is the radius of the circle.