Geometry · Points, Lines & Angles
Line
HSG-CO.A.1
Definition
A straight path of points that extends infinitely in both directions, with no thickness.
Examples
- Line AB extends forever in both directions through points A and B.
- Line AB and line BA name the same line.
Key rule
A line has no endpoints — it goes on forever both ways.
Memory hook
No start, no end, straight forever.