∠AOB = 140
180. ∠BOC = 180-140 = 40
om - бис-са
40/2=20 - ∠BOM
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∠AOB = 140
180. ∠BOC = 180-140 = 40
om - бис-са
40/2=20 - ∠BOM
180. угол BOC = 180-140 = 40
om - бис-са
40/2=20 - угол BOM