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x+15 - kąt przy ramionach = 55 +15 = 70
x+x+x+15 = 180
3x + 15 = 180
3x = 165
x= 55
a-kąt przy podstawie
3a+15=180
3a=195
a=65
3α=165 /3
α=55
α=55
α=55
α+15=70