Math Homework. Do It Faster, Learn It Better.


A plane is a flat surface that extends infinitely in all directions. Given any three non-collinear points, there is exactly one plane through them.

A plane can be named by a capital letter, often written in script, or by the letters naming three non-collinear points in the plane.

For example, the plane in the diagram below could be named either plane A B C or plane P .

plane with 3 points

Two planes can be parallel (planes A and C in the figure below), or they can intersect in a line (planes A and B .)