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In Euclidean geometry, if they are coplanar they must intersect. But if they are in different planes, they may not. The following example will illustrate this:
Picture yourself in a cuboid room - ie a normal shaped room. Stand with your back to one of the walls. Ray 1 forms the join of the wall behind you and the floor. Ray 2 is the line where the wall facing you meets one of the side walls. Rays 1 and 2 are not parallel but they can never meet - because they are not in the same plane.
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What are coplanar lines rays or segments that do not intersect?
If rays, parallel ones. If segments there are many more options because you can have a segment that is not long enough to reach the point of intersection.
How many times do parallel lines intersect?
parallel lines never intersect.
Would parallel lines intersect at a 90 degree angle?
no they are parallel therefore they will never intersect
Does parallel lines intersect at an angle of 90 degrees?
If lines intersect they CANNOT BE PARALLEL. Speak to your teacher!
What are lines that do not intersect called?
Lines that never intersect are parallel.
