In school, I'm doing this thing called moment of inertia given by the formula(adsbygoogle = window.adsbygoogle || []).push({});

[tex]I = \int y^2 dA[/tex]

If the object being solved for is a rectangle where the base of it is parallel to the x axis, dA is equal to xdy. From there, the integration is easy. If the object to solve the integration for is a circle (or anything with slants like a triangle), I don't know how to do it. How do I solve for dA of a circle?

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# Homework Help: Integrating and circles

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