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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
A+B+C=90+30+60=180 stopni
b=(90 +c):2
c=90-b
b= (90+90-b):2
2b=180-b
3b=180
b=60
c=90-60=30
a=90°
b=60°
c=30°