A "line" doesn't stop and doesn't have ends.
A "segment" does and has.
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lines and line segments
When two line segments intersect, an angle is created. The degree of the angle depends on the positions of the two intersecting lines. The wider the space between the two intersecting lines, the larger number of degrees the angle encompasses.
it is the point of a segment and three lines in it.
it means three lines a line begins and ends at a point
Tangent.