https://github.com/schteppe/p2.js/blob/master/src/shapes/Convex.js
http://www.gamedev.net/topic/342822-moment-of-inertia-of-a-polygon-2d/
https://en.wikipedia.org/wiki/Circumscribed_circle
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https://github.com/schteppe/p2.js/blob/master/src/shapes/Convex.js