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A tetrahedron has vertices O (0, 0, 0), ...

A tetrahedron has vertices O (0, 0, 0), A (1, 2, 1), B (2, 1, 3) and C(-1, 1, 2). The angle between the faces OAB and ABC will be:

A

`90^(@)`

B

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

C

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

D

`30^(@)`

Text Solution

Verified by Experts

The correct Answer is:
(b)
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