Coplanar Definition (Illustrated Mathematics Dictionary) - Math Is Fun

Math is Fun ABCDEFGHIJKLMNOPQRSTUVWXYZ Definition of Coplanar

Lying on a common plane.

3 points are always coplanar because you can have a plane that they are all on.

But more than 3 points are usually NOT on the one plane (unless they are carefully chosen to be).

../geometry/images/polyhedra.js?mode=coplanar See: Plane, Collinear, Point Copyright © 2025 Rod Pierce

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