suma unghiurilor unui triunghi este 180grade
A/3=B/5=C/7
A=3B/5
C=7B/5
3B/5+B+7B/5=180 aducem la acesi numitor -5
3B+5B+7B=5*180=> 15B=900=> B=60grade
A=3*60/5=> A=36grade
C=7*60/5=> C=84grade
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suma unghiurilor unui triunghi este 180grade
A/3=B/5=C/7
A=3B/5
C=7B/5
3B/5+B+7B/5=180 aducem la acesi numitor -5
3B+5B+7B=5*180=> 15B=900=> B=60grade
A=3*60/5=> A=36grade
C=7*60/5=> C=84grade