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x=1kat
2x=2kąt
2x+20⁰=3kąt
x+2x+2x+20=180
5x=180-20
5x=160
x=160:5
x=32
kąty mają:
1kąt ma 32⁰
2 kąt ma 2x=2×32=64⁰
3 kąt ma:2x+20=64+20=84⁰
spr. 32+64+84=180
2α-drugi kąt = 2×32°=64°
2α+20°-trzeci kąt = 2×32°+20°=84°
α+2α+2α+20°=180°
5α=180°-20°
5α=160°
α=32°