The moment of inertia for a thin rod of mass M and length L about a perpendicular axis through one end of the rod is , while the moment of inertia for a thin rod about a perpendicular axis through its center of mass is MATH]\frac{1}{12}ML^2[/tex] (see here). Combine these with the Parallel axis theorem to find the moment of inertia of each rod about the desired axis; then sum these values.

--Kevin C.