∠АВМ:∠МВС = 3:1;
∠АВМ + ∠МВС = ∠АВС = 160°
пусть ∠АВМ - a, ∠МВС - b
a = 3b;
a + b = 160;
3b + b = 160;
b = 40; a = 120;
∠АВМ = 120°
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∠АВМ:∠МВС = 3:1;
∠АВМ + ∠МВС = ∠АВС = 160°
пусть ∠АВМ - a, ∠МВС - b
a = 3b;
a + b = 160;
3b + b = 160;
b = 40; a = 120;
∠АВМ = 120°