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постройте параллепипед ABCDA1B1C1D1.
Укажите: а) две пары перпендекулярных прямых; б) все ребра перпендикулярные плоскости (А1В1С1);
в) прямые, перпендикулярные прямой А1С1; г) найдите угол между прямыми А1В1 и DD1; д) найдите градусную меру угла В1АD.-
Предмет:
Алгебра -
Автор:
nancymarks720 - 6 лет назад
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Ответы 1
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№33на наклонная составляет с плоскостью угол 45 градусов.№32Точка А отстоит от плоскости на расстоянии 26 см. Найдите длину №31Дан куб ABCDA1B1C1D1,1) Выпишите грани, параллельные ребру AA12) выпишите рёбра, скрещивающиеся с ребром ВС3) выпишите рёбра, перпендикулярные плоскости (ABB1) 4) выпишите плоскости, перпендикулярные ребру AD.№30Радиусы оснований усечённого конуса равны Здм и 7дм. Образующая - 5дм. Найдите площадь осевого сечения.№29Шар пересечён плоскостью на расстоянии Зсм от центра. Найдитеплощадь сечения, если радиус шара равен 5см.№28Измерения прямоугольного параллелепипеда равны 8см, 12см, 18см.
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Автор:
brooks - 6 лет назад
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