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Creating a Pie Chart
Video
http://www.youtube.com/watch?v=W60F_517PVY
http://www.youtube.com/watch?v=D4XgnFbMCxk
Website
http://msemac.redwoods.edu/~kyokoyama/math376/math376pdf/sect7-6.pdf
http://math.tutorvista.com/statistics/pie-chart.html