Решите : * треугольник авсд - правельный , т.о пересечение медиан , од перпендикулярна авс , од=2 см , ав = 3см , найти tg угла фи , угол фи = вд^авс
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BO=2/3√9 - 2,25 =1/3√31
tg угла фи=DO:BO= 12/31*√31