ISI2015-MMA-45

Question

Angles between any pair of $4$ main diagonals of a cube are

• A. $\cos^{-1} 1/\sqrt{3}, \pi – \cos ^{-1} 1/\sqrt{3}$
• B. $\cos^{-1} 1/3, \pi – \cos ^{-1} 1/3$
• C. $\pi/2$
• D. none of the above

Comments

b??

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Yes. B is the correct answer.

Answer 1

answer is B