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.
Non-parallel lines intersect at some point, parallel lines don't.
Parallel
In 2D geometry, that is the definition of parallel lines. Two non-intersecting lines are indeed parallel.
no, if two lines are not parallel then the will eventually have to intersect.Alternate perspective:Yes, if two lines are non-parallel, they need not intersect in three dimensional space.
Parallel lines
No, parallel lines are straight lines.
Strictly speaking, the answer is no. There is an implicit assumption that parallel lines refer to straight lines and, since there are no straight lines in a rainbow, there cannot be any parallel lines. The lines are concentric and so they never meet.
Non-parallel lines intersect at some point, parallel lines don't.
Parallel
A shape with 4 straight lines in which there are 2 parallel and 2 unparallel lines is called a Trapezium.
In 2D geometry, that is the definition of parallel lines. Two non-intersecting lines are indeed parallel.
Straight lines that never cross are called parallel lines.
no, if two lines are not parallel then the will eventually have to intersect.Alternate perspective:Yes, if two lines are non-parallel, they need not intersect in three dimensional space.
Parallel lines are straight lines which are oriented the same way. For example, two railway lines are parallel to each other.
Parallel lines
Two straight lines that remain equal distance apart are parallel lines.
the lines which are not parallel to each other are non collinear lines