Предмет: Геометрия, автор: lacostewww

Вершины треугольника ABC лежат на окружности с центром в точке O.Известно что угол OBC =55 найдите величину игла BAC 

Ответы

Автор ответа: an602
0
Рассмотрим треугольник ВОС. В нём углы ОВС=55,ВСО=55, ВОС=70-центральный угол, а угол ВАС-вписанный, опирающийся на эту же дугу. Значит ВАС=1/2ВОС=35
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