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0,5x-drugi kąt
x+20°-trzeci kąt
x+0,5x+x+20°=180°
2,5x=180°-160°
2,5x=160°/:2,5
x=64°
0,5x=0,5*64°=32°
x+20°=84°
miary kątów to 64°,32° i 84°