Find the moment inertia of a thin rectangle with sides \(a, b\) and mass \(m\) around axis perpendicular to the picture and pass through the centar of rectangle.

Hint: Moment of inertia of the rod around axis passing through his centar is \(I=\frac{ml^2}{12}\) where \(l\) is the lenght of the rod.

\(a=3, b=4, m=12\)

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