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220' : 2 = 110'
miary kątów : 90' , 50' . 110' , 110'
b) 360' - 2* 110' = 140'
140' : 2 = 70'
miary kątów : 110' , 110' , 70' , 70'
c) 360' - 2* 135' = 90'
90' : 2 = 45'
miary kątów : 135' , 135' , 45' , 45'