Geometry · Points, Lines & Angles
Plane
HSG-CO.A.1
Definition
A flat, two-dimensional surface that extends without end in every direction.
Examples
- Three points that are not on the same line name exactly one plane, Plane P.
- A tabletop extended infinitely in every direction represents a plane.
Key rule
A plane is perfectly flat and extends infinitely in all directions.
Memory hook
An endless flat sheet.