The centroid of a semicircle is noted at being (4r)/(3 pi) - http://en.wikipedia.org/wiki/List_of_centroids. However, when I did the work myself using the integral of y da over the area, I came up with (2 r)/(pi). I figured I was doing something wrong so sought out someone else's work and found this:(adsbygoogle = window.adsbygoogle || []).push({});

http://books.google.com/books?id=P7...&dq=analytically centroid semicircle&pg=PA164

Who is right?

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# Centroid of a Semicircle

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