Stage 29 · Spatial Vectors & Solid Geometry
29.1.4 Collinear Vectors and Testing Direction
29.1 From Plane Vectors into Space — Spatial Vectors and Linear Operations
Point 4 of 6
29.1.4 Collinear Vectors and Testing Direction
Core ideaTwo arrows that point along the same line share one direction, written b=λa, which is exactly what collinear means.
Module goal. Carry the familiar arrow of a plane vector into three dimensions, build up addition, subtraction, scalar multiplication, and tests for collinear and coplanar vectors in space, picking up where the last stage's feel for solid shapes left off.