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Консультация № 193706
16.10.2018, 11:56
0.00 руб.
1
6
1
Уважаемые эксперты! Не могу понять, в чем ошибка, с ответом не сходится. Должно быть 3/5
Прикрепленные файлы:
Обсуждение
16.10.2018, 12:02
общий
Адресаты:
-3-3=-6, тогда -6/10=-3/5
но косинус угла между прямыми АС и BD равен модулю угла между векторами, то есть |-3/5|=3/5
но косинус угла между прямыми АС и BD равен модулю угла между векторами, то есть |-3/5|=3/5
21.10.2018, 22:43
общий
Адресаты:
Михаил Александров но косинус угла между прямыми АС и BD равен модулю угла между векторами
Косинус угла равен модулю угла?
Об авторе:
Facta loquuntur.
Facta loquuntur.
24.10.2018, 09:32
общий
это ответ
Здравствуйте, xwzs!
За угол между прямыми AC и BD можно принять любой из двух углов, образованных этими прямыми. Косинус острого угла получается равным 3/5, а косинус тупого угла -- равным -3/5.
Четырёхугольник ABCD является прямоугольником, расположенным в плоскости x=0. Выполнив рисунок, можно увидеть, что, например, угол, на который нужно повернуть прямую AC в направлении против часовой стрелки (обычно принимаемое за положительное) вокруг точки пересечения до совпадения с прямой BD, -- острый.
За угол между прямыми AC и BD можно принять любой из двух углов, образованных этими прямыми. Косинус острого угла получается равным 3/5, а косинус тупого угла -- равным -3/5.
Четырёхугольник ABCD является прямоугольником, расположенным в плоскости x=0. Выполнив рисунок, можно увидеть, что, например, угол, на который нужно повернуть прямую AC в направлении против часовой стрелки (обычно принимаемое за положительное) вокруг точки пересечения до совпадения с прямой BD, -- острый.
Об авторе:
Facta loquuntur.
Facta loquuntur.
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