The vertices of a Delta ABC are A(2, 3, 1), B( -2, 2, 0) and C(0, 1, -1). What is the cosine of angle ABC?

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Q 1713156940.     The vertices of a Delta ABC are A(2, 3, 1),
B( -2, 2, 0) and C(0, 1, -1).

What is the cosine of angle ABC?
NDA 2014 Paper 1 April
A

1 /sqrt(3)

B

1/sqrt(2)

C

2/sqrt(6)

D

None of these

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