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Angle between faces of the tetrahedron with vertices O, (1,2,1), (2,1,3), (-1,1,2)

The same question, asked 3 times: May 2022 S1*, 13 May 2024 S2*, 25 Apr 2025 S1. Every wording below, oldest first.

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  1. Question 1

    May 2022 S1

    124
    A tetrahedron has vertices P(1,2,1), Q(2,1,3), R(−1,1,2) and O(0,0,0). Then the angle between the faces OPQ and PQR is

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  2. Question 2

    13 May 2024 S2

    131
    A tetrahedron has vertices at P(2,1,3),Q(−1,1,2)P(2,1,3), Q(-1,1,2), R(1,2,1)R(1,2,1) and O(0,0,0)O(0,0,0), then angle between the faces OPQ and PQR is

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  3. Question 3

    25 Apr 2025 S1

    119
    A tetrahedron has vertices O(0,0,0),A(1,2,1)O(0,0,0),A(1,2,1), B(2,1,3),C(−1,1,2)B(2,1,3),C( - 1,1,2). Then the angle between the faces OAB and ABC will be

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