If , respectively, are the position vectors of points A, B, C and D, then find the angle between the straight lines AB and CD. Deduce that AB and CD are parallel.
Let be position vectors of points A, B, C, D respectively. Let be angle between AB and CD
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175.Find the projection of the vector on the vector .
Short Answer Type
we always have 
.
, we always have 
is any vector, then show that
, res
be angle between AB and CD
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on the vector 
.
on the vector 
.
on the vector 
in the direction of 
in the direction of 
.
on 
where
