# Doubt from complex number

• sir my doubt is to get ans by geomatry i know algebric approch
but how prove that minimum distance from 4th point of coordinate of traingle comes out when 4th point is centroid..
@Hari_Shankar sir , @Jagdish_Singh sir , @Sourav_Dey sir , @Sharad

\textbf{ignore the above written question language}

• sir my doubt is to get ans by geomatry i know algebric approch
but how prove that minimum value of above will only come when z will lie on \textbf{centriod} of traingle..
@Hari_Shankar sir , @Jagdish_Singh sir , @Sourav_Dey sir , @Sharad