Circle-insribed angles intercept an arc which is twice as big as the angle so QRS = 57*2 = 114
then arc SPQ = 360 - 114 = 246 degrees this arc is intercepted by angle QRS and is TWICE the angle QRS
and then angle QRS = 1/2 * 246 = 123 degrees
Circle-insribed angles intercept an arc which is twice as big as the angle so QRS = 57*2 = 114
then arc SPQ = 360 - 114 = 246 degrees this arc is intercepted by angle QRS and is TWICE the angle QRS
and then angle QRS = 1/2 * 246 = 123 degrees