this is probably a very stupid question but how is there 180/pi radians in a circle when one radian is found where the angles circumference arc is equal the radius??

what i mean is, if you look at this image where 1 radius is calculated, id does not look as though there would be 57 radians (180/pi) around this circle but more like 7 point something...

http://mathworld.wolfram.com/images/...Radian_700.gif

thanks in advance