P5b = split a regular pentagon in 5 equal area pieces with minimum perimeter. This is not the optimal solution. 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 ( 0.308242979,-0.314093062) arc 11 ( 0, 0.256158816) 0.648229079 [centercoordinates and radius] arc 12 ( 0.972037334, 0.764590572) 1.266562801 [centercoordinates and radius] arc 13 (-1.019033642,-0.276854729) 1.327798901 [centercoordinates and radius] vertex 2 ( 0.21264176, 0.219154976) arc 21 = arc 13 arc 22 (-8.220055533, 6.822870736) 10.71071638 [centercoordinates and radius] arc 23 ( 0,-1.281553998) 1.515699159 [centercoordinates and radius] yields the following cutlength CL = 3.533871812