They remain separated
By calculating the gradient of a given line, one can establish whether it is overlapping or not overlapping. Parallel lines do not overlap.
Any two non-overlapping circles.
draw two triangles with overlapping 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.
Non interesting lines are called lines
Are non-parallel lines.
Skew lines
No. You can have at most two vertices where an odd number of lines meet. The required figure has four.
skewed lines
Non coplanar lines.
Ellipses and non-square rectangles have two lines of symmetry.
No.