In the adjoining figure, if BC = a, AC = b, AB = c and ∠CAB = 120° – McqOptions

MCQOPTIONS

1.	In the adjoining figure, if BC = a, AC = b, AB = c and ∠CAB = 120° , then the correct relation is:
A.	a2 = b2 + c2 + 2 bc
B.	a2 = b2 + c2 – 2 bc
C.	a2 = b2 + c2 + bc
D.	a2 = b2 + c2 – bc
Answer» D. a2 = b2 + c2 – bc

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