created 08/26/97; revised 08/14/00; 07/26/03
CHAPTER 10 — Angle between 3D Vectors
We have used the dot product in several calculations:
- Length: Dot product of vector with itself = length2
- Perpendicularity: Dot product of perpendicular vectors = 0
cos θ =
dot product of two unit vectors
This chapter adds nothing new, but extends the third application
to the angle between vectors in 3D space.
What is the angle between two edges of a cardboard box that meet in a corner?