???????????????????? "measure av ark" ??????????????
yu sae "ark"...that impli yu talk bout a serkel
yu menshun "26 deg"...yu hav a angel sumweer????????
perhaps yu send out 2 raes from serkel senter tu serkel rim????????
& the 2 lines R 26 deg apart...angel tween em=26 deg???????
the LENG av ark=serkel radius*(26deg/360 deg)
=0.0722222222222 radius