Vector Projection
Introduction
If a and b are two vectors, the vector projection of a on b is the vector a1 with the same direction as b and with the length:
When θ is not known, we can compute cosθ using the following property of Dot Product a∙b:
Thus, the length of a1 can be also computed as follows:
Since a1 is in the same direction as b,
Where 
is the Unit Vector with the same direction as b:
References & Resources
- Wikipedia - http://en.wikipedia.org/wiki/Vector_projection
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