S6a = split a square in 6 equal area pieces with minimum perimeter. Not optimal solution.
      origin of coordinates:  in the middle of the square
      if there are symmetries in the solution the data are given only for the significant part

border
     (-0.5,-0.5)
     (-0.5,+0.5)
     (+0.5,-0.5)
     (+0.5,+0.5)

vertex 1    ( -0.04028522,-0.207095316)
     arc 11 (        -0.5,-1.315834614) 1.200266849  [centercoordinates and radius]
     arc 12 ( 1.525060642,-2.248589795) 2.572548809  [centercoordinates and radius]
     arc 13 ( -2.27121993,        -0.5) 2.250080628  [centercoordinates and radius]

vertex 2    (  0.06874430, -0.12794129)
     arc 21 = arc 12
     arc 22 (         0.5, 0.775337365) 1.000946454  [centercoordinates and radius]
     arc 23 (-1.564697603,           0) 1.638444819  [centercoordinates and radius]

yields the following cutlength
     CL = 2.948360079