P5 = split a regular pentagon in 5 equal area pieces with minimum perimeter
     origin of coordinates:  in the middle of the pentagon
     if there are symmetries in the solution the data are given only for the significant part

border
     (           0, 0.850650808)
     ( 0.809016994, 0.262865556)
     (         0.5,-0.68819096)
     (-0.809016994, 0.262865556)
     (           0, 0.850650808)

vertex 1    (           0,-0.061321281)
     arc 11 ( 1.209342767,-2.155964397) 2.418685534  [centercoordinates and radius]

vertex 2    ( 0.136022062, 0.011527789)
     arc 21 = arc 11
     arc 22 ( 1.290988747, 1.746222086) 2.084013519  [centercoordinates and radius]
     arc 23 ( 1.253200003, -0.05985229) 1.11945597   [centercoordinates and radius]

yields the following cutlength
     CL = 3.338314698