01 Key Concepts
Line
A straight path that extends infinitely in both directions, with no endpoints.
Line Segment
A finite piece of a line with two definite endpoints, like the segment between points A and B.
Ray
A part of a line with one endpoint that extends infinitely in only one direction.
Parallel Lines
Two lines in the same plane that never intersect, no matter how far they extend, and always stay the same distance apart.
Perpendicular Lines
Two lines that intersect at exactly a 90-degree angle.
Intersecting Lines
Two lines that cross at exactly one shared point.
02 Solved Examples
Example 1 A path has one clear starting point but continues forever in one direction. What is this called?
- A single endpoint with infinite extension in one direction matches a specific geometric term.
Answer: A ray
Example 2 Two lines meet at exactly 90 degrees. What are they called?
- Lines meeting at a right angle have a specific name.
Answer: Perpendicular lines
Example 3 Two railroad tracks run side by side, always the same distance apart, and never meet. What term describes them?
- Lines that maintain constant distance and never intersect share a specific name.
Answer: Parallel lines
03 Practice Questions
1Does a line have endpoints?
No, it extends infinitely in both directions
2Does a ray have one endpoint or two?
One
3Does a line segment have one endpoint or two?
Two
4Do parallel lines ever intersect?
No
5At what angle do perpendicular lines intersect?
90 degrees
📄 Lines — Downloadable Worksheet
10 questions with a full answer key. Grab the PDF to print, or try the interactive version in your browser.