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Задача 56:
Автор - Григорий Забазнов
Источник: MGO 2024, задача 4

На сторонах AB и AC треугольника ABC выбраны точки E и F соответственно так,что B,E,F,C лежат на одной окружности. Прямые BF и CE пересекаются в точке K. Отражение прямой AK относительно биссетрисы угла BAC пересекает BF и CE в точках M и N.
Доказать, что если окружность (MKN) касается BC, то она касается и EF.



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Задача 56:
Автор - Григорий Забазнов
Источник: MGO 2024, задача 4

На сторонах AB и AC треугольника ABC выбраны точки E и F соответственно так,что B,E,F,C лежат на одной окружности. Прямые BF и CE пересекаются в точке K. Отражение прямой AK относительно биссетрисы угла BAC пересекает BF и CE в точках M и N.
Доказать, что если окружность (MKN) касается BC, то она касается и EF.

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Telegram was co-founded by Pavel and Nikolai Durov, the brothers who had previously created VKontakte. VK is Russia’s equivalent of Facebook, a social network used for public and private messaging, audio and video sharing as well as online gaming. In January, SimpleWeb reported that VK was Russia’s fourth most-visited website, after Yandex, YouTube and Google’s Russian-language homepage. In 2016, Forbes’ Michael Solomon described Pavel Durov (pictured, below) as the “Mark Zuckerberg of Russia.” On Telegram’s website, it says that Pavel Durov “supports Telegram financially and ideologically while Nikolai (Duvov)’s input is technological.” Currently, the Telegram team is based in Dubai, having moved around from Berlin, London and Singapore after departing Russia. Meanwhile, the company which owns Telegram is registered in the British Virgin Islands. For example, WhatsApp restricted the number of times a user could forward something, and developed automated systems that detect and flag objectionable content. "Your messages about the movement of the enemy through the official chatbot … bring new trophies every day," the government agency tweeted. "For Telegram, accountability has always been a problem, which is why it was so popular even before the full-scale war with far-right extremists and terrorists from all over the world," she told AFP from her safe house outside the Ukrainian capital.
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