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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),a n dC(-1,1,2),` then angle between face `OA B` and `A B C` 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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