Application of integrals to find moment Inertia

[Kumaken]

I need to make a project that integrates physics with math, involving the use of integrals to find moment inertia of areas. The theory could be read here :http://www.intmath.com/applications-integration/6-moments-inertia.php

I need to make an object that applies the theory above. Can anybody recommend me what should I make?

*note : I have a few idea in mind like making small windmill or fan blades that rotate, but are they appropriate? Cause I think the theory only applies to 2D objects...

*another note : If it's too much hassle, what project do you think is simple that involves the application of integrals in physics? Thank you very much in advance.

 

[epenguin]

For anything that is symmetric above with below a plane will be like you concentrated all the mass that has coordinates x, y into the xy plane, maybe that extends your possibilities.

 

[Kumaken]

For anything that is symmetric above with below a plane will be like you concentrated all the mass that has coordinates x, y into the xy plane, maybe that extends your possibilities.

I'm sorry but I kinda do not understand... can you please elaborate? Sorry for the trouble.