Question

1. if a transversal crosses parallel lines then _ are supplementary.

a. vertical angles b. alternate interior angles
c. corresponding angles d. same - side interior angles

Explanation:

• Vertical angles are equal, not supplementary.
• Alternate interior angles are equal when a transversal crosses parallel lines.
• Corresponding angles are equal when a transversal crosses parallel lines.
• By the same - side interior angles theorem, when a transversal crosses parallel lines, same - side interior angles are supplementary.

Answer:

D. same - side interior angles