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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.

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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 

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Correct option d. 90° – θ

Explanation:

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