1.Дан квадрат ABCD. Найдите угол между векторами CA и BC.2.Найдите скалярный квадрат вектора c=6j

1.Дан квадрат ABCD. Найдите угол между векторами CA и BC.
2.Найдите скалярный квадрат вектора c=6j
- Предмет:
  Математика
- Автор:
  corychan
- 6 лет назад

Ответы 1

1) Угол между векторами СА и ВС равен углу между векторами ВС и ВА1, где ВА1║СА (совместили начала векторов, вектор СА параллельно перенесли , совместив начало вектора СА, точку С, с началом вектора ВС, точкой В). Угол равен 90°+45°=135°, см. рисунок.2) Скаляаный квадрат вектора с: $\vec{c}=6\vec{j}\; \; \to \; \; \vec{c}=(0,6,0)\\\\\vec{c}^2=|\vec{c}|^2=0^2+6^2+0^2=6^2=36$
- Автор:
  kenziegj1c
- 6 лет назад
- 0
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1.Дан квадрат ABCD. Найдите угол между векторами CA и BC.2.Найдите скалярный квадрат вектора c=6j

Ответы 1

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1.Дан квадрат ABCD. Найдите угол между векторами CA и BC.
2.Найдите скалярный квадрат вектора c=6j