Question

two lines are perpendicular if they: never intersect. intersect at random angle measures. intersect at 90 degree angles.

Explanation:

Perpendicular lines are defined as lines that intersect at a right angle (90 degrees). The first option ("never intersect") describes parallel lines. The second option ("intersect at random angle measures") is incorrect as perpendicular lines have a specific angle measure (90 degrees). The third option aligns with the definition of perpendicular lines.

Answer:

intersect at 90 degree angles.