Q.
Consider the following statements
Statement I The angle between two planes is twice the angle between their normals.
Statement II If $\theta$ is the angle between two planes, then $180-\theta$ is also the angle between same planes.
Choose the correct option.
Three Dimensional Geometry
Solution:
The angle between two planes is defined as the angle between their normals [Fig (a)]. Observe that, if $\theta$ is an angle between the two planes, then so is $180-\theta[ Fig$ (b)].
