1) <А=60 В=30 С=90, 2) А=60 , В=α , С=11α , 60+α+11α=180, α+11α=180-60, 12α=120, α=120/12=10, 60+10+110=180
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1) <А=60 В=30 С=90, 2) А=60 , В=α , С=11α , 60+α+11α=180, α+11α=180-60, 12α=120, α=120/12=10, 60+10+110=180