Necessary condition for the application of parallel axes theorem:
IA=IB+Md2
where A and B are the axes of rotation of body and M is the mass of body.
Necessary condition for the application of perpendicular axes theorem:
IA=IB+Md2
where A and B are the axes of rotation of body and M is the mass of body are
1. Axis B must pass through C.O.M of body
2. Axis A must be parallel to axis B
3. d must be shortest distance between axis A and axis B