Finding midpoint of rectangle in 3D vectors

Question

If given the points (-10,-2,0), (-10,2,0), (-12,0,2) and (-12,0,-2), how do I find the midpoint?

Answer 1

the formula for the midpoint if given two points is given by $$M\left(\frac{x_1+x_2}{2};\frac{y_1+y_2}{2};\frac{z_1+z_2}{2}\right)$$

Answer 2

The centroid of any n points is simply the average of the vectors defining them.