The direction ratios of two lines are

Question:

The direction ratios of two lines are $3,2,-6$ and $1,2,2$, respectively. The acute angle between these lines is

A. $\cos ^{-1}\left(\frac{5}{18}\right)$

B. $\cos ^{-1}\left(\frac{3}{20}\right)$

C. $\cos ^{-1}\left(\frac{5}{21}\right)$

D. $\cos ^{-1}\left(\frac{8}{21}\right)$

Solution:

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