Question

Janelle says that lines l and m are skew lines.

Planes B and A intersect. Plane B is vertical and contains vertical line n. Plane A is horizontal and contains horizontal line m. Line m and n are perpendicular. Line l is on plane A and it is slightly diagonal.
Is Janelle correct?

Yes, because the lines are not parallel.
Yes, because the lines will intersect.
No, because the lines are in the same plane.
No, because the lines are perpendicular.

Answer 1

No — because the lines are in the same plane.

Both l and m lie in plane A, so they are coplanar; skew lines must be non‑coplanar.