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General

Easy

Question

# Let OPQR is a tetrahedron such that O is origin and are position vectors of P, Q, R respectively and a is the angle which OP makes with face PQR then

- 1
- 2
- tana =
- none of these

## The correct answer is: 2

### To find the angle made by OP with face PQR

It is given that OP=p

OQ=q

OR=r

PQR=(OQ-OP) X(OR-OQ)=(q-p)X(r-q)

Angle=

Hence required angle is 2.

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