The centroid of a triangle is the intersection of the midlines of the three sides of the triangle. When the geometric body is a homogeneous object, the centroid coincides with the centroid.

In a plane rectangular coordinate system, the coordinates of the center of gravity are the arithmetic mean of the coordinates of the vertices.

That is, its coordinates are ((X1+X2+X3)/3, (Y1+Y2+Y3)/3;

Space rectangular coordinate system - horizontal coordinate: (X1+X2+X3)/3, vertical coordinate: (Y1+Y2+Y3)/3, vertical coordinate: (Z1+Z2+Z3)/3