α+β+ω=180°
α+1/2α+α+20°=180°
2,5α=160°
α=64°
β=64/2=32°
ω=64+20=84°
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α+β+ω=180°
α+1/2α+α+20°=180°
2,5α=160°
α=64°
β=64/2=32°
ω=64+20=84°