Question

the base line de and the top face line mn are _______ lines.
options: parallel, perpendicular, the same, skew

Explanation:

Step1: Recall line types

Skew lines are non - parallel, non - intersecting, and in different planes. Parallel lines are in the same plane and never meet. Perpendicular lines intersect at 90 degrees. “The same” line would be coincident.

Step2: Analyze DE and MN

DE is on the base (a vertical - like plane in the diagram) and MN is on the top face (a horizontal - like plane relative to DE's plane). They don't intersect and aren't parallel (since they are in different planes), so they are skew.

Answer:

D. skew