If theta is the acute angle between the diagonals of a cube, then which one of the following is correct?

### Question Asked by a Student from EXXAMM.com Team

Q 2309112018.     If theta is the acute angle between the diagonals of a
cube, then which one of the following is correct?
NDA 2013 Paper 1
A

theta = 30^(circ)

B

theta = 45^(circ)

C

2 cos theta =1

D

3 cos theta =1

#### HINT

(Provided By a Student and Checked/Corrected by EXXAMM.com Team)

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