углы S и L =180
S + L=2+1==3
180/3=60
L=R=60
S=M=120
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<S=2<L
3<L=180°=> <L=<R=60°
<S=<M=120°
углы S и L =180
S + L=2+1==3
180/3=60
L=R=60
S=M=120