#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
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.
The lead from Wall Street offers little clarity as the major averages opened lower on Friday and then bounced back and forth across the unchanged line, finally finishing mixed and little changed.The Dow added 33.18 points or 0.10 percent to finish at 34,798.00, while the NASDAQ eased 4.54 points or 0.03 percent to close at 15,047.70 and the S&P 500 rose 6.50 points or 0.15 percent to end at 4,455.48. For the week, the Dow rose 0.6 percent, the NASDAQ added 0.1 percent and the S&P gained 0.5 percent.The lackluster performance on Wall Street came on uncertainty about the outlook for the markets following recent volatility.
JUSTSCIENCEMATH Telegram Group from cn