Stage 29 · Spatial Vectors & Solid Geometry
29.3.2 The Normal Vector of a Plane
29.3 Seeing Parallel and Perpendicular with Vectors — Direction and Normal Vectors
Point 2 of 6
29.3.2 The Normal Vector of a Plane
Core ideaThe arrow n stuck perpendicular into a plane represents the entire surface, much like a flagpole stands for the ground it's planted in.
Module goal. Translate lines and planes into two handy "keys," the direction vector and the normal vector, and use vectors being collinear or perpendicular to settle parallelism and perpendicularity among lines and planes.