Circle 4 = split a circle in 4 equal area pieces with minimum perimeter
     origin of coordinates:  in the middle of the circle
     if there are symmetries in the solution the data are given only for the significant part


vertex 1    (-0.183427791699874, 0)
     arc 11 (-5.92064394641676,-3.31238329132486) 6.62476658264973  [centercoordinates and radius]
     

yields the following cutlength (radius being 1)
     CL = 3.92887114473208