hmm I am just a liitle confused in this Steradian. Now I know that this works only with 3D.
Now a radian is = arc of the size of a radius/radius
2*22/7*r/r = 360'
2*22/7rad = 360'
22/7rad = 180'
Now that's how a radian is counted in 2D
Is there any connection like this...