Предмет: Геометрия, автор: kenvi6190

помогите пожалуйста 30 баллов

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Автор ответа: lilikanl

рассмотрим треугольники САО и треугольник ВОD
УголВ=углу А(в дано)
ВО=АО(в дано)
угол СОА=углу ВОD(т.к. вертикальные)
Из этого следует что треугольники равны по 2 признаку равенства треугольников.
Следовательно что все сответственные углы и стороны равны. А значит что СО=СD=12см

kenvi6190: откуда 12 см

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