Точка C є внутрішньою точкою кута AOB. Яке з поданих тверджень є правильним?
А ∠COB=∠AOB-∠AOC
Б ∠COB+∠AOB=∠COA
В ∠COB=∠AOC-∠AOB
Г ∠COB=∠AOB+∠AOC
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