Сторони трикутника 10 см 10 см і 12 см знайдіть радіуси вписаного і описаного кіл​

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ответ: 64 см

Объяснение:    Примем больший угол равным х. Тогда меньший равен х-60°. Сумма углов при одной стороне параллелограмма 180°. Ромб - параллелограмм. Поэтому х+х-60°=180°=>  

  2х=240°, х=120°.  Меньший угол 120°-60°=60°. Диагонали ромба являются биссектрисами его углов. Поэтому меньшая диагональ ромба делит его на два треугольника с углами, равными 60°. => Эти треугольники равносторонние. Следовательно, стороны ромба равны меньшей диагонали.  Стороны ромба равны.

Р(ромба)=4•16=64 см.