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Caption=Какие углы образует хорда АВ,~~равная радиусу окружности, ~~с касательной к данной окружности~~в точке А?
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Caption=1. Перемещая точку А, исследуйте ~~    величину угла ВАС.~~2. Изменится ли градусная мера угла ВАС ~~    при разных значениях радиуса ~~    данной окружности?~~3. Докажите полученный результат.
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Caption=1. Дана окружность. Постройте хорду ~~    данной длины. Запишите макрос построения.~~2. Запишите макрос построения ~~    касательной к окружности в точке на окружности.~~3. Создайте собственный чертеж и решите ~~    по нему данную задачу.
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