help calulating the monent of inertia

[parttime]

http://www.physicsforums.com/attachment.php?attachmentid=7049&d=1149234489three identical thin rods each of lenght L and massM are welded perpendicluar to one another determine the monemt of inertia of the structure pink line is the axis of rotation. i think i need to use Icm= 1/12 ML^2 and I=1/3ML^2
but not sure which rod uses which formula

[mukundpa]

If the pink line is passing through the end of C then the MI for Rod C is 1/3ML^2.

For MI of A, think of the distance of different particles of the rod A from the axis.

For MI of B you have to use Parallel axis theorem. Go through it.

MP

[parttime]

thanks i got it now