trigonometric center of gravity is trigonometric tripartite center line intersection point. When the geometry is homogeneous, the center of gravity and centroid coincide.

In a plane cartesian coordinate system, the barycenter coordinates are the arithmetic average number of vertex coordinates,

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

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