regular hexagon...polygon with 6 sides
rim-leng=390, so 1 side=390/6=65
polygon area=10,976.871993
put ko-ordinut at (0,0) at senter av polygon & get bottom at y=-56.2916512
hite=+112.583302
alfa=60deg, beta=60 deg, tan(beta)=1.7320508076
inside angel=120 deg, outside angel=60 deg
inside serkel: rad=56.2916512 & area=9954.921705 (senter=(0,0))
outside serkel: rad=65, area=13273.228961
note: for all regular polygons, area=(1/2)*rim-leng*inside radius
=(n/4)*side*side*tan(beta)