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 \angleRQP=\theta, then what is \anglePRQ equal to? [NDA I 2018]

NDA Math Three Dimensional Geometry

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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?

[NDA I 2018]

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