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Here is my situational plea. My calculus teacher is horrible at teaching and god help me i have tried to get help in every position possible, so i am now hoping you guys can help me. I love calculus and I am sure i would i enjoy it more if i had a better teacher.

The problem is I have to find the Centroid of the equation f(x)=sqrt(r^2-x^2) between the intervals of -r and r.

Thankyou for your time in advance please give detailed steps if possible.