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Caption=Знайдіть невідомий кут трикутника,~~якщо два інших кута дорівнюють:~~50° и 30°; 40° и 75°;~~65° и 80°; 25° и 120°.
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Caption=1. Передвигаючи точки А, В та С, подберить ~~   кути з умови та знайдіть невідомий кут.~~2. Чи існує взаємозв'язок між значеннями~~   кутів трикутника? Знайдіть її.~~3. Дослідить взаємозв'язок між величинами~~  зовнішнього та внутрішнього кутів трикутника.
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