Formula
$$x_0=\dfrac{x_1+x_2+x_3}{3},\,\,\, y_0=\dfrac{y_1+y_2+y_3}{3}$$
Variables
A(x1,y1)
→
Triangle vertice
B(x2,y2)
→
Triangle vertice
C(x3,y3)
→
Triangle vertice