Re: [Math4u] Given two 3-d vectors, determine angle

 

    Don't forget that the angle equals the dot product divided by the product of the magnitudes of the vectors.  In other words, the angle actually equals the product of the unit vectors.  Suppose that the vectors are a and b and that theta is the angle between them.

 theta =  ( a * b) / ( || a || || b || ) = ( a / || a || ) / ( b / || b || )

Roland Josefek

 

 

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