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A ray.

Q: What do you call a part of a line that has one endpoint and extends endlessly in one direction called?

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It is called a Ray.

It is called as a plain.

A plane?

It is called the "endpoint". If another question that you have bout what the end of a ray is called, there is no such a thing, since the ray begins in one point (called the endpoint) and expands infinitely in the other direction... Much like this arrow I will draw you.... ( THIS IS THE ENDPOINT!)------------------------------>(There is no ending here, just keeps on going and going and going... you get the point) Perhaps it is better for you to look at your lessons? best, A.K.A., Uchiha Itachi

A flat extending endlessly in all directions is called a plane.

Related questions

It is called a Ray.

It's called a Ray.

This is called a "ray". (It is equal to one half of a line.)

It is called as a plain.

A part of a line that extends in one direction with one endpoint is called 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. :)

A line is a straight path that extends infinitely or endlessly in opposite directions. A straight path that joins two points is called a line segment.

A plane?

It is called a line segement

The end would be called a point or an endpoint. It only has one end since it is infinite in the other direction.

It is called the "endpoint". If another question that you have bout what the end of a ray is called, there is no such a thing, since the ray begins in one point (called the endpoint) and expands infinitely in the other direction... Much like this arrow I will draw you.... ( THIS IS THE ENDPOINT!)------------------------------>(There is no ending here, just keeps on going and going and going... you get the point) Perhaps it is better for you to look at your lessons? best, A.K.A., Uchiha Itachi

A flat extending endlessly in all directions is called a plane.