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B=x
C=1/2(x+90)
A+B+C=180
90+x+1/2x+45=180
3/2x=180-135
3/2x=45
x=30
A=90 stopni
B=x=30 stopni
C=1/2(x+90)=1/2(30+90)=1/2*120=60 stopni
90°+30°=120°
120°:2=60°