Question

in the diagram below, lines \\( \overleftrightarrow{ab} \\) and \\( \overleftrightarrow{cd} \\) are \\( \underline{quadquad} \\).
a. skew
b. parallel
c. perpendicular

Explanation:

Step1: Recall Line Relationships

Perpendicular lines intersect at 90°. Parallel lines never intersect. Skew lines are non - parallel, non - intersecting in 3D.

Step2: Analyze the Diagram

In the given diagram, lines \(\overleftrightarrow{AB}\) and \(\overleftrightarrow{CD}\) intersect at a right angle (90° is marked).

Step3: Match with Definitions

Since they intersect at 90°, they are perpendicular. Skew is for 3D non - intersecting, parallel lines don't intersect. So the correct option is C.

Answer:

C. perpendicular