Question

select the correct choice that completes the sentence below. two intersecting lines are if they form right angles when they intersect. parallel obtuse vertical acute perpendicular straight

Explanation:

By definition, two intersecting lines that form right - angles are perpendicular. Parallel lines do not intersect. Obtuse, acute, and straight are terms related to angles or single lines, not the relationship between two intersecting lines forming right - angles.

Answer:

perpendicular