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В неравностороннем треугольнике ABC I – центр вписанной, O – центр описанной окружностей. Прямая λ проходит через точку I перпендикулярно OI. Прямая, симметричная прямой BC относительно λ пересекает AB и AC а точках K и L. Докажите, что центр окружности AKL лежит на прямой OI.
В неравностороннем треугольнике ABC I – центр вписанной, O – центр описанной окружностей. Прямая λ проходит через точку I перпендикулярно OI. Прямая, симметричная прямой BC относительно λ пересекает AB и AC а точках K и L. Докажите, что центр окружности AKL лежит на прямой OI.
After fleeing Russia, the brothers founded Telegram as a way to communicate outside the Kremlin's orbit. They now run it from Dubai, and Pavel Durov says it has more than 500 million monthly active users. Oh no. There’s a certain degree of myth-making around what exactly went on, so take everything that follows lightly. Telegram was originally launched as a side project by the Durov brothers, with Nikolai handling the coding and Pavel as CEO, while both were at VK. And indeed, volatility has been a hallmark of the market environment so far in 2022, with the S&P 500 still down more than 10% for the year-to-date after first sliding into a correction last month. The CBOE Volatility Index, or VIX, has held at a lofty level of more than 30. In 2018, Russia banned Telegram although it reversed the prohibition two years later. Telegram boasts 500 million users, who share information individually and in groups in relative security. But Telegram's use as a one-way broadcast channel — which followers can join but not reply to — means content from inauthentic accounts can easily reach large, captive and eager audiences.
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