A disc of mass.m. and radius R has a concentric hole of radius .r.. Its M.I. about an axis through centre and normal to its plane is

A disc of mass.m. and radius R has a concentric hole of radius .r.. It

1.	A disc of mass.m. and radius R has a concentric hole of radius .r.. Its M.I. about an axis through centre and normal to its plane is
Answer» `m/2(R-r)^(2)` `m/2(R^(2)-r^(2))` `m/2(R+r)^(2)` `m/2(R^(2) + r^(2))` ANSWER :D