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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

`30^(@)`

C

`90^(@)`

D

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

Text Solution

Verified by Experts

The correct Answer is:
D
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