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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) ((19)/(35))`

B

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

C

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

D

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

Text Solution

Verified by Experts

The correct Answer is:
A
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MODERN PUBLICATION-THREE DIMENSIONAL GEOMETRY -COMPETITION FILE
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