Centroid G(z) of the triangle ABC is the point of concurrence of medians of triangle ABC and is given by
Z=\[\frac{z_1+z_2+z_3}{3}\]
where \[ z_1=a+ib\]
\[ z_2=c+id\]
\[ z_3=x+iy\] are complex coordinates of triangle ABC.
If \[ z_1=1+2i\] ,\[ z_2=2+5i\] and \[ z_3=3+5i\]
then centroid of triangle ABC is givebn by \[ \frac{1+2i+2+5i+3+5i}{3}\]=\[ \frac{6+12i}{3}=2+4i\]
