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A+B=180-C=180-70=110
α+β+70=180
α+β=180-70
α+β=110
W trójkącie ABP:
1/2α+1/2β+kąt APB =180
1/2(α+β)+kąt APB =180
1/2*110+kąt APB =180
55+kąt APB =180
kąt APB =180-55
kąt APB =125