Q. 125.0( 2 Votes )

If A, B, C, D are

Answer :

Given are points, A, B, C and D.

Let O be the origin.


We have,


Position vector of A



Position vector of B



Position vector of C



Position vector of D



Now, let us find out and .


Position vector of B-Position vector of A






And,


Position vector of D-Position vector of C






The projection of along is given by,





[ we know that, and .


So,


Also, we know that, ]




Multiply numerator and denominator by √21.




Projection = √21


Thus, projection of along is √21 units.


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