<M = 2<OMN = 36°*2 = 72°
<N = 2<ONL = 40°*2 = 80°
<L = 180°-72°-80° = 28°
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<M = 2<OMN = 36°*2 = 72°
<N = 2<ONL = 40°*2 = 80°
<L = 180°-72°-80° = 28°