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spndsh
 3 years ago
when do you use the dot product?
spndsh
 3 years ago
when do you use the dot product?

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TuringTest
 3 years ago
Best ResponseYou've already chosen the best response.1the most simple answer I can give you to that very general question when you want to determine how parallel two lines are, or the angle between them

spndsh
 3 years ago
Best ResponseYou've already chosen the best response.1ok, how do you use dot product to find a vector projection?

TuringTest
 3 years ago
Best ResponseYou've already chosen the best response.1Given two vector \(\vec a\) and \(\vec b\) the projection of \(\vec b\) onto \(\vec a\) is given by\[\text{proj}_{\vec a}\vec b={\vec a\cdot\vec b\over\\vec a\^2}\vec a\]

TuringTest
 3 years ago
Best ResponseYou've already chosen the best response.1where \[\\vec a\\] is the magnitude of \(\vec a\)
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