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Консультация № 191873
24.11.2017, 16:27
0.00 руб.
0
6
1
Здравствуйте, уважаемые эксперты! Прошу вас ответить на следующий вопрос:
Из точки А проведены две прямые, одна касается окружности в
точке В, а другая пересекает окружность в точках D и C, точка D лежит
между точками А и С. Известно, что BD =3, BC = 4,cosA=7/8.
Найти
АВ и радиус окружности.
Из точки А проведены две прямые, одна касается окружности в
точке В, а другая пересекает окружность в точках D и C, точка D лежит
между точками А и С. Известно, что BD =3, BC = 4,cosA=7/8.
Найти
АВ и радиус окружности.
Обсуждение
26.11.2017, 14:50
общий
это ответ
Здравствуйте, KSIW2S!
Рассмотрим доказательство теоремы о касательной и секущей.
Для нашего случая получим
(ед. длины),
(ед. длины).
Рассмотрим доказательство теоремы о касательной и секущей.
Для нашего случая получим
(ед. длины), (ед. длины).
5
Об авторе:
Facta loquuntur.
Facta loquuntur.
28.11.2017, 16:12
общий
28.11.2017, 16:27
Не могу понять, почему при нахождении радиуса мы берем треугольник ABD, он ведь не вписан в окружность??
28.11.2017, 17:02
общий
Адресаты:
Благодарю Вас за проверку решения! Я исправил ошибку.
Об авторе:
Facta loquuntur.
Facta loquuntur.
28.11.2017, 17:03
общий
Адресаты:
Обратите, пожалуйста, внимание на исправления в решении задачи.
Об авторе:
Facta loquuntur.
Facta loquuntur.
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