Assume that
If is any vector, then show that
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.
Find the projection of the vector on the vector .
Find the projection of the vector on the vector
Find the projection of in the direction of
Find the projection of in the direction of .
Find the projection of on where
Short Answer Type
, 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.
we always have 
.
Switch
, we always have 
is any vector, then show that
on the vector 
.
on the vector 
.
on the vector 
in the direction of 
in the direction of 
.
on 
where
