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2 alfa = 50
kąt CDA = 180 – 75 = 105
kąt DCB = 180 – (50 + 105) = 180 – 155 = 25
kat ADC = 180 – 2*70 = 180 – 140 = 40
kat CDB = 180 – 40 = 140
alfa = 180 – (140 + 20) = 180 – 160 =20