Concept 1 of 8Foundation
Watch on YouTubeVideoPoint, line, ray, segment
- Point: a tiny dot, no size. Named with capital letters: A, B.
- Line: straight path extending forever in BOTH directions. Notation: ↔AB or line ℓ.
- Ray: starts at a point, extends forever in ONE direction. Like a torch beam. Notation: →AB.
- Line segment: has two endpoints. Has a fixed length. Notation: AB̄.
Two lines either meet at exactly one point (intersecting) or never meet (parallel).
Example
On your ruler, the edge is a line segment (has ends). A number line conceptually extends forever — it's a line.
💡 Tip:Line ↔ two arrows; Ray → one arrow; Segment — two dots.
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5 questions to check what you just read.
0 / 5
- Q1.Which has TWO endpoints?
- Q2.A ray has ___ endpoint(s):
- Q3.A line has:
- Q4.Two lines that never meet are:
- Q5.The edge of your ruler is a: