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A tetrahedron has vertices P(1,2,1),Q(2,...

A tetrahedron has vertices `P(1,2,1),Q(2,1,3),R(-1,1,2) and O(0,0,0)`. The angle beween the faces OPQ and PQR is :

A

`cos^(-1)((17)/(31))`

B

`cos^(-1)((19)/(35))`

C

`cos^(-1)((9)/(35))`

D

`cos^(-1)((7)/(31))`

Text Solution

Verified by Experts

The correct Answer is:
B
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MCGROW HILL PUBLICATION-THE DIMENSIONAL GEOMETRY -QUESTIONS FROM PREVIOUS YEARS. AIEEE/JEE MAIN PAPERS
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