Предмет: Математика, автор: Fufun1ke3

С помощью чего можно показать, что прямые перпендикулярны?

Fufun1ke3: пж у меня учитель сейчас прям спрашивает

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Автор ответа: Pavlo1129

Відповідь:

За допомогою косинця

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