Final answer:
When a transversal is perpendicular to parallel lines, vertical angles are formed, 90-degree angles are formed, and several congruent angles are formed.
Step-by-step explanation:
When a transversal is perpendicular to parallel lines, the following statements that could be true are:
- Vertical angles are formed: Vertical angles are pairs of angles that are opposite each other when two lines intersect. These angles are always congruent.
- Ninety-degree angles are formed: When a transversal is perpendicular to parallel lines, all the angles formed are right angles and measure 90 degrees.
- Several congruent angles are formed: When a transversal is perpendicular to parallel lines, the angles formed on the same side of the transversal are congruent.