Предмет: Геометрия, автор: nadibodlak2

Точка O — центр окружности, изображенной на рисунке. Чему равна градусная мера угла AOC?
відповідб має бути 140°

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Ответы

Автор ответа: Kазак
2
АВС - вписанный угол, опирающийся на дугу, которая больше него в два раза
∩АС = 2*∠АВС = 2*110 = 220°
Это левая часть окружности, пустая, от А до С.
На эту дугу опирается центральный угол АОС, тоже равный 220°
Но он превосходит 180°, и принято писать дополнение этого угла до 360°
∠АОС = 360 - 220 = 140°
Этому центральному углу соответствует дуга АВС - часть круга от точки А до точки С, проходящая через точку В


Автор ответа: velyadeermanbe
1
Угол abc вписанный =  равен половине дуги на которую опирается - дуга ас =220.вся дуга  360, 360- 220 =140 .угол аов  центральный  = равен дуге на которую опирается 
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