I do not know how exactly is called. Suppose there is a rectangle of this type:
How to determine his center? Decartian coordinate system, the coordinates of each vertex are known (x, y). Or tell me which way smoking.
Answer 1, Authority 100%
must work for any parallelepiped:
xc = average (x0, x1, x2, x3)
yc = average (y0, y1, y2, y3)
Even 2 opposite vertices are sufficient:
xc = average (x0, x1)
YC = Average (Y0, Y1)