oukhti diri fi balak bali tole al9awss houwa 9iss azawiya bi radian sama diri al3amaliya al3aksiya talgay 9iss azawiya houwa 2.5 radiyan / bach thawli la daraja 3andak 180°=p radiyan **p houwa al3adad li na3arfouh 3.14... ** sama talgay 360/p samatalgay 143° bi tadwir ila alwihda