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Let a G and b G be the vectors along the diagonals of a parallelogram having area 2 2 . Let the angle between a G and b G be acute, | a | G = 1, and | b a | | b . a | G G G G × = . If c G = b 2 ) b a ( 2 2 G G G − × , then an angle between b G and c G is

1. 4 π
2. 4 π −
3. 6 5 π
4. 4 3 π

Correct answer: 4 3 π

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