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The cosine of the angle between two body diagonals of a cube is:
A1/2
B2/3
C1/sqrt(3)
D1/3
Answer & Solution
Correct answer: D. 1/3
Diagonals with ratios (1,1,1) and (-1,1,1) give dot product 1 over 3, so cos = 1/3.
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