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180 - (180 - 115) - 90 = 180 - 65 - 90 = 115 - 90 = 25
2 trójkąt
180 - (47 + 90 ) = 180 - 137 = 43
(180 - 47) / 2 = 133 / 2 = 66.5
66.5 - 43 = 23,5
3 trójkąt
60/ 2 = 30
180 - (90 + 30) = 180 - 120 = 60
180 - 60 = 120