Published by:
CGP EDU Academic Team
Published on: August 13, 2026
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
B
C
D
Text Solution
Verified by ExpertsThe correct answer is:
A
Sol.
Vector perpendicular to face OAB = 
= 
Vector perpendicular to face ABC = 
= 
Angle between two faces cos θ = 
= 
⇒ θ = cos –1 
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