∠1=68° ∠2=∠3
∠1+∠2+∠3=180°⇒∠2+∠3=180°-68°=112°
∠2=∠3=112°/2=56°
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∠1=68° ∠2=∠3
∠1+∠2+∠3=180°⇒∠2+∠3=180°-68°=112°
∠2=∠3=112°/2=56°