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


Position vector of D-Position vector of C

The projection of along is given by,

[ we know that, and .


Also, we know that, ]

Multiply numerator and denominator by √21.

Projection = √21

Thus, projection of along is √21 units.

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