∠1=∠2 ⇒ 1=2=100/2=50°;
∠1+∠3=180 ⇒ ∠3=180-50=130°.
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∠1=∠2 ⇒ 1=2=100/2=50°;
∠1+∠3=180 ⇒ ∠3=180-50=130°.