Question

19. In triangle ABC, LA + LB = 140°, then LC​

Answer 1

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∠A+∠B=65 o −−−(1)

∠A+∠C=140 o−−−(2)

we know ∠A+∠B+∠C=180 ofrom (1)

65 o +∠C=180 o from (2)

∠C=115 o