The moment of inertia of a rod of length l about an axis passing through its centre of mass and perpendicular to rod is I . The moment of inertia of hexagonal shape formed by six such rods, about an axis passing through its centre of mass and perpendicular to its plane will be
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Moment of inertia of rod AB about its centre and perpendicular to the length = 
= I
∴ ∴ 
Now moment of inertia of the rod about the axis which is passing through O and perpendicular to the plane of hexagon I rod = 
[From the theorem of parallel axes] 
Now the moment of inertia of system I system
= 
I system = 5 (12 I ) = 60 I [As 
]
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