How do I find out the center of gravity coordinates of a triangle knowing the coordinates of A B and C?

I don't have much of a clue.

How do I find out the center of gravity coordinates of a triangle knowing the coordinates of A B and C?
If we call the three vertices A=(x1,y1); B=(x2,y2) and C=(x3,y3) then the coordinates of the geocenter would be





(x1+x2+x3)/(3), y1+y2+y3)/(3)


Just as clueless, so I got this from site:


http://www.pballew.net/centroid.html

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