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It sigals that the line is not just a line segment but that this line does NOT end.... ever.

Q: Why does a line have two arrows at the end of it?

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It is still a line (since lines are continuous, it has two arrows, one on each end of the line). The dots are used to name the line.it is called an number line

a line. arrow on one end is called a ray and no arrows is called a line segment.

a line with two end points

If you mean a straight line that does not extend BEYOND it's two end points, then that would be a 'line segment.'

The arrows at the ends of a number line indicate that the line extends forever in both directions (i.e. towards positive infinity and negative infinity)...since there is no largest or smallest real number.

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a line with two arrows on the end.

a line with arrows on each end. it must have points in between the two arrows

It is still a line (since lines are continuous, it has two arrows, one on each end of the line). The dots are used to name the line.it is called an number line

A line

a line. arrow on one end is called a ray and no arrows is called a line segment.

A number line extends infinitely in both directions, proven with two small arrows on either end It is numbers... in a line!!!! :)

A line.

A line (a line extends forever in both directions).

In Mathematics it may indicate parallel lines. In Chemistry it may indicate a reversible reaction.

if its a line it goes on forever so it has arrows on each end. For a segment you just make a dot, measure 46 millimeters and put another dot on that end. No arrows on a segment.

Yes because perpendicular line our made out of lines that go on forever so yah it has to have arrows

This is simply called a line. <---------------O-------------------------------O----------------------> But this is called a line segment: O-------------------------------------------O