1.

The coordinates of the vertices P, Q and R of a triangle PQR are (1, -1, 1) (3, -2, 2) and (0, 2, 6) respectively. If ∠RQP = θ, Then what is ∠PRQ equal to?

A. 30° + θ
B. 45° - θ
C. 60° - θ
D. 90° - θ
Answer» E.


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