Question

what is mean centroid

Answer 1

The centroid of a triangle is the intersection of the three medians of the triangle (each median connecting a vertex with the midpoint of the opposite side). It lies on the triangle's Euler line, which also goes through various other key points including the orthocenter and the circumcenter that is called centroid

Answer 2

it mean that "the centre of mass of a geometric object of a uniform density...."":

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