HP5 = split a regular heptagon 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
     radius of circumscribed circle = 1

border
     (           0,	-1)
     ( 0.781831482,	-0.623489802)
     ( 0.974927912,	 0.222520934)
     ( 0.433883739,	 0.900968868)
     (-0.433883739,	 0.900968868)
     (-0.974927912,	 0.222520934)
     (-0.781831482,	-0.623489802)
     (           0,	-1)

vertex 1    (           0,     0.044670085)
     line   (           0,     0.044670085) to  ( 0,	 0.900968868)
     arc 11 ( 1.042191004,	 1.849797855) 2.084382008 [centercoordinates and radius]

vertex 2    ( 0.215293964,	-0.063547289)
     arc 21 same as arc 11
     arc 22 ( -13.36570967,	18.20511168 ) 22.76373345 [centercoordinates and radius]
     arc 23 (  2.494439001,	 0.201258511)  2.294476893[centercoordinates and radius]

yields the following cutlength
     CL* = 4.511074251

in units of sidelenght: 
     CL=CL*/(2*0.433883739)=5.198482732