Answer:
∠A=120°; ∠B=20°.
Explanation:
1) ∠A+∠B+∠C=180°;
2) 6x+x+40=180°; ⇒ x=20;
3) ∠A=6x; ⇒ ∠A=120°;
∠B=x; ⇒ ∠B=20°.
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