10×12/2=60°
360-(60×2)=240°
240:2=120
углы: 120 и 60
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10×12/2=60°
360-(60×2)=240°
240:2=120
углы: 120 и 60
tg B =2/((d₂/d₁)-(d₁/d₂)).
d1 =12см, d2=10см