Two lines lie in the same plane and extend in the same direction without ever intersecting. This relation is called what?

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

Answer: (A)

Two lines in the same plane that go in the same direction and never meet are parallel lines. The key idea is that parallel lines stay in the same direction and do not intersect no matter how far you extend them. This is different from perpendicular lines, which cross at a right angle, and from lines that intersect, which meet at a point. The term similar isn’t used for lines, so the description matches parallel lines precisely.