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Geometric Transformations
More Uses of the Dot Product
Finding the length of a projection
If W is a unit vector, then P W is the length of the projection of P onto the line containing W
Determining right angles
Perpendicular vectors always have a dot product of 0 because the cosine of 90o is 0
Example: 
and 
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Geometric Transformations - 09 MAY 95
Page 22 of 51
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