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.. I

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