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in Mathematics by (42.1k points)
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A vector \(\vec a\) is parallel to the line of intersection of the plane determined by the vectors \(\hat i, \hat i + \hat j\) and the plane determined by the vectors \(\hat i - \hat j, \hat i + \hat k\). The obtuse angle between \(\vec a\) and the vector \(\vec b = \hat i - 2\hat j + 2\hat k\) is 

(A) \(\frac{3\pi}{4}\)

(B) \(\frac{2\pi}{3}\)

(C) \(\frac{4\pi}{5}\)

(D) \(\frac{5\pi}{6}\) 

1 Answer

+1 vote
by (48.4k points)
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Best answer

Correct option is (A) \(\frac{3\pi}{4}\)

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