Published by:
CGP EDU Academic Team
Published on: August 13, 2026
A tetrahedron has vertices at 
, 
and 
. Then the angle between the faces 
and 
will be
A
B
C
D
Text Solution
Verified by ExpertsThe correct answer is:
A
Angle between two plane faces is equal to the angle between the normals 
and 
to the planes. 
the normal of face OAB is given by
.....(i)
the normal of face ABC is given by 
and 
i.e. , 
and 
…..(ii)
If θ θ be the angle between 
and 
, then
.
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