Stage 29 · Spatial Vectors & Solid Geometry
29.3.1 The Direction Vector of a Line
29.3 Seeing Parallel and Perpendicular with Vectors — Direction and Normal Vectors
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29.3.1 The Direction Vector of a Line
Core ideaWhichever way a line points, use an arrow d aimed the same way to stand in for the whole line.
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.