JEE Main 2019 — Math solution | Fundamenthol

JEE Main2019Math

Q.

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

A
$cos^{- 1} (\frac{19}{35})$
B
$cos^{- 1} (\frac{9}{35})$
C
$cos^{- 1} (\frac{17}{31})$
D
$cos^{- 1} (\frac{7}{31})$

Solution

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