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formula for calculate centroid of triangle:--
                                                 C = {x1+x2+,x3 ÷ 3, y1+y2+y÷3}
                                                                                PLZ MARK IT BEST
2 4 2
In 2d geometry its x1/3 +x2/3+x3/3   ,y1/3+y2/3+y3/3
and in 3d well we have just addition of z axis thats all the diff
in 3d x1/3+x2/3++x3/3   ,,y1/3+y2/3+y3/3       z1/3+z2/3+z3/3
1 4 1
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