Stage 29 · Spatial Vectors & Solid Geometry
29.3.3 Finding a Plane's Normal Vector
29.3 Seeing Parallel and Perpendicular with Vectors — Direction and Normal Vectors
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29.3.3 Finding a Plane's Normal Vector
Core ideaMake n perpendicular to two vectors lying in the plane at once, and solving n·a=0 and n·b=0 hands you n.
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.