A) \[{{\cos }^{-1}}\left( \frac{19}{35} \right)\]
B) \[{{\cos }^{-1}}\left( \frac{17}{31} \right)\]
C) \[{{30}^{o}}\]
D) \[{{90}^{o}}\]
Correct Answer: A
Solution :
If and inclined at an angle , then Vector perpendicular to face Vector perpendicular to face Since, angle between faces equals angle between their normals. Therefore.You need to login to perform this action.
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