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МатематикаВопрос:
Every isosceles triangle is a:
Ответ:
Ответ:
1. Тупоугольный (неверно, может быть остроугольным или прямоугольным)
2. Остроугольный (может быть)
3. Прямоугольный (может быть)
Обоснование:
Равнобедренный треугольник может быть остроугольным (например, с углами 80°, 50°, 50°), прямоугольным (с углами 90°, 45°, 45°) или тупоугольным (например, с углами 120°, 30°, 30°). Утверждение, что он является только тупоугольным, неверно. Скорее всего, в оригинале имелось в виду, что любой из углов может быть тупым, но это также не совсем точно, так как сумма углов 180°.
Учитывая контекст, скорее всего, имелось в виду, что равнобедренный треугольник может быть остроугольным.
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