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A tetrahedron has vertices O(0,0,0), A(1...

A tetrahedron has vertices O(0,0,0), A(1,2,1), B(2,1,3) and C(-1,1,2). Then the angle between the faces OAB and ABC is

A

`cos^(-1) ((sqrt3)/(35) ) `

B

`cos^(-1) (21/35)`

C

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

D

`cos^(-1) ((sqrt35)/(3))`

Text Solution

Verified by Experts

The correct Answer is:
A
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