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**Ok i need some help with some homework that is to derive formula for moment of inertia of a few objects about the axis's that i have mentioned**

1. Rectangular slab about axis through center(sides a,b)

2. Annular cylinder about central axis (radii R1 and R2)

1. Rectangular slab about axis through center(sides a,b)

2. Annular cylinder about central axis (radii R1 and R2)

**The only equation i know is Moment of inertia = ∫r[itex]^2[/itex]dm**

**any help would be appriciated**

I am new here so if this has been answered pls help me locate and lock this up...

Thanking in advance....