About an axis passing through the tip: I x = I y = m ( 3 20 r 2 + 3 5 h 2 ) About an axis passing through the base: I x = I y = m ( 3 20 r 2 + 1 10 h 2 ) About an axis passing through the center of mass: I x = I y = m ( 3 20 r 2 + 3 80 h 2 )