Planes
in Space
Note: The normal to a plane can be
determined by taking the cross product of any two non-parallel lines
(vectors) in the plane. Further note: The angle between any two
intersecting planes can be determined by finding the normal to each
plane, say n1 and n2 , and then by finding the
dot product of these two vectors. Let
θ be the angle
between n1 and n2
cos θ
= n1 ∙ n2 /
| n1 | | n2 | |
Copyright © 2017 Richard C. Coddington
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