Предмет: Геометрия, автор: Anvoskanyan2005

Все стороны четырехугольника DABC равны, AE - средняя линия основания ABC. Покажите, что прямые DE և BC перпендикулярны.

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Автор ответа: 647134
1

Теорема. Для перпендикулярности прямых a и b необходимо и достаточно, чтобы направляющий вектор прямой a был перпендикулярен направляющему вектору прямой b. Доказательство этого условия перпендикулярности прямых основано на определении направляющего вектора прямой и на определении перпендикулярных прямых.

Anvoskanyan2005: Спасибо большое ❤️
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