December 2021 0 13 Report
ДАЮ 100 БАЛЛОВ! ДАТЬ ПОЛНОЕ РЕШЕНИЕ!!! РЕШЕНИЕ ОБЯЗАТЕЛЬНО(С РИСУНКОМ)!!! Точка D лежит внутри равностороннего треугольника ABC. Оказалось, что ∠ADC=150∘, AD=20, DC=21. Найдите BD.
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