Next: 12.2 Planes
Up: 12 DirectionsPlanes and Lines
Previous: 12 DirectionsPlanes and Lines
Given a vector (a,b,c) in three-space, the direction cosines of this vector are
Here the direction angles , , are the angles that the vector makes with the positive x-, y- and z-axes, respectively. In formulas, it is usually the direction cosines that occur, rather than the direction angles. We have
Wed Oct 4 16:41:25 PDT 1995
This document is excerpted from the 30th Edition of the CRC Standard Mathematical Tables and Formulas (CRC Press). Unauthorized duplication is forbidden.