Параллельные прямые и конгруэнтность фигур Диафильм по математика для 4-5 классов
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![Мнимая ошибка, над которой ломали голову 2 000 лет [Veritasium]](https://sun9-80.userapi.com/_DY-ttp-l_X1frUwXwaNvlcvKxFTs4K2U73EoA/NAlIFwSut-U.jpg)
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