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60o*2=120o
120o-90o=30o
30o+60o+90o=180o
plis o naj
II kąt - x
III kąt - (90+x):2
90+x+(90+x):2 = 180
x+(90+x):2 = 180-90
x+(90+x):2 = 90 |*2
2x+90+x = 180
3x = 180-90
3x = 90 |:3
x = 30
I kąt - 90
II kąt - 30
III kąt - (90+30):2 = 120:2 = 60
czyli 30 i 60