Mathematics · 2019
JEE Main · 12 January 2019, Shift 1 · Q84
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 O P Q and P Q R is:
A tetrahedron has vertices $\displaystyle \mathrm{P}(1,2,1)$, $\displaystyle Q(2,1,3), R(-1,1,2)$ and $\displaystyle O(0,0,0)$. The angle between the faces $\displaystyle O P Q$ and $\displaystyle P Q R$ is :
Official answer
(1)
$\displaystyle \cos ^{-1}\left(\frac{19}{35}\right)$
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JEE Main 2019 Mathematics question, with the answer from NTA’s final answer key. Where our answers come from.