Răspuns:
Explicație pas cu pas:
∡A=a
∡B=b
∡C=c
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a+b+c=180°
3a=2b
a=2b/3
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3c=4b
c=4b/3
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2b/3+4b/3+³⁾b= ³⁾180°
2b+4b+3b =540⁰
9b= 540⁰
b=540:9
b= 60⁰ (∡B)
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a=2b/3=(2*60)/3=120/3=40° (∡A)
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c=4b/3=(4*60)/3=240/3=80°(∡C)
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arc AB= 2*80=160°
arc BC= 2*40=80°
arc AC= 2*60=120°