r = pi * u / [360 * SIN(u / 2)]
Well, Holy Sin, Batman:
r = pi * u / [360 * SIN(u / 2 * pi / 180)]
I will seek forgiveness for my Sin by reciting the Hoooooly Rosary
twice, skipping no beads...and sweating in fear for good measure...
Got a few bucks to lend me, buddy? Need groceries...
will forgive you provided the Sin is of a rational angle when expressed in radians