Question

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

Explanation:

Step1: Recall definitions

Coplanar lines lie in the same plane. Parallel lines are in the same plane and never intersect. Perpendicular lines intersect at a right - angle in the same plane. Skew lines are non - parallel and non - intersecting and are non - coplanar.

Step2: Analyze diagram

Lines a and d do not lie in the same plane. They are not parallel, not perpendicular, and not skew (since skew lines are non - parallel and non - intersecting in 3 - D but here we first note they are not in the same plane). So they are non - coplanar.

Answer:

non - coplanar.