Question

consider the diagram
lines a and d are
non - coplanar
parallel
perpendicular
skew

Explanation:

Lines \(a\) and \(d\) are non - coplanar. Parallel lines lie in the same plane and do not intersect. Perpendicular lines intersect at a right angle (\(90^{\circ}\)) and lie in the same plane. Skew lines are non - parallel and non - intersecting but are a special case of non - coplanar lines. However, non - coplanar is a more general term that directly describes the relationship as the lines do not lie on the same plane.

Answer:

non - coplanar