Предмет: Алгебра, автор: Аноним

В равнобедренном треугольнике угол при основании равен 20°. Найдите угол, заключенный между боковыми сторонами.

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Автор ответа: Ellenochka

0

Сумма углов треугольника 180°.
Угол между боковыми сторонами 180° - 2*20° = 140°

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