4 point mass system M.I=mr^2,m=mass,r=distance 4m axis

4 continuous mass system M.I=integration of dm*r^2.

4 objects such as sphere,ring etc. u can remeber it as

mr^2,and then put corresponding values of

,such as for ring =1,disc =2,hollow sphere =2/3,solid sphere =2/5.

u may also compress 3d objects to 2d objects as they will hav the same M.I

rate me if u find it helpful.