A straight line is one which travels in exactly one direction, never bending or curving.
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angular line are the straight lines and sharp points contain in any things....
Collinear points are points on the same straight line.
a line segment
No, they have to be straight. --------------------------- ------------------ Those are parallel lines because they are straight. In geometry, a non-straight line has no meaning. It is allowed that arcs, planes and such can be parallel. In common usage, a twisting and turning line can be described as parallel to another, such as the rails of a railroad track, even though they are not co-planar or straight. It may not be proper by geometric definition but it is descriptive and conveys the meaning adequately.
Yes. If it is not straight, then it is not a line.