Two lines cross at a single point. What is this relationship called?

• A. Parallel
• B. Similar
• C. Intersecting
• D. Perpendicular

Answer: (C)

When two lines cross each other, they meet at exactly one point. This describes intersecting lines. The key idea is that intersecting means the lines share a common point, regardless of the angle at which they cross. If they happened to form a right angle, that would be a special case of intersecting lines called perpendicular, but the general term for crossing lines is intersecting. Parallel lines, on the other hand, never meet, and similar is a term used for comparing shapes, not the relationship between two lines. So the relationship described is intersecting.