#геометрия #задача
Серединные перпендикуляры к сторонам AB и AC треугольника ABC пересекают медиану AM в точках D и E соответственно. Прямые BD и CE пересекаются в точке F. Докажите, что F лежит на окружности, проходящей через A и середины сторон AB и AC.
BY JustScience | Олимпиадная Математика
Telegram is riding high, adding tens of million of users this year. Now the bill is coming due.Telegram is one of the few significant social-media challengers to Facebook Inc., FB -1.90% on a trajectory toward one billion users active each month by the end of 2022, up from roughly 550 million today.
A Telegram spokesman declined to comment on the bond issue or the amount of the debt the company has due. The spokesman said Telegram’s equipment and bandwidth costs are growing because it has consistently posted more than 40% year-to-year growth in users.
JUSTSCIENCEMATH Telegram Group from fr