http://logansweberap.blogspot.com/2010/02/3-nights-7-times-forgetting-to-save-7.html

This link will show you a guide to be a genius!
http://theweek.com/article/index/255043/how-to-be-a-genius

Guys, I find an another formula for finding the centroid using coordinates of the verticles: (x1+ x2+x3) divided by 3, (y1+y2+y3) divided by 3

For example, Find the Centroid: R(-6,2), S(-2,6), T(2,4)
-6+ -2 + 2= -6 divided by 3 = to -2, and 2 + 6 + 4= 12 and divided by 3 = to 4!
If you plug those in, then you get the centroid! : (-2,4),

this question is from the geometry textbook pg. 346 # 15