Three point locations on the surface of a drilled hole have been measured by a CMM in the x-y axes. The three coordinates are: (16.42, 17.17), (20.20, 11.85), and (24.08, 16.54), where the units are mm. These coordinates have been corrected for probe radius. Determine (a) the coordinates of the hole center and (b) the hole diameter, as they would be computed by the CMM software.