Asked by Big Papa

Consider the diagram.

Planes M and N intersect at line d. Lines a, b, and e are on plane M. Line a is vertical and forms a right angle with line d. Line b is diagonal and goes up and to the right. Line e is at the top of the plane and is close to being horizontal. Line c is on plane N and goes slightly up and to the right.
Lines a and d are

non-coplanar.
parallel.
perpendicular.
skew.

All Answers 1

Answered by GPT-5 mini AI
Perpendicular.

Reason: Both a and d lie in plane M, and the problem states that a makes a right angle with d, so they are perpendicular.