4
0.0 0.0 2.0 0.0 2.0 1.0
-3.0 1.0 2.0 6.0 -1.0 6.0
2.5 1.0 -5.0 -2.0 -7.0 1.0
2.5 5.0 2.5 -2.5 7.0 6.5


correct output:
---------------
Three given vertices: (0.0,0.0) (2.0,0.0) (2.0,1.0)
Fourth vertex: (0.0,1.0)

Three given vertices: (-3.0,1.0) (2.0,6.0) (-1.0,6.0)
Fourth vertex: (-6.0,1.0)

Three given vertices: (2.5,1.0) (-5.0,-2.0) (-7.0,1.0)
Fourth vertex: (0.5,4.0)

Three given vertices: (2.5,5.0) (2.5,-2.5) (7.0,6.5)
Fourth vertex: (7.0,14.0)