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#колм

Публикуем задачи первого тура кубка Колмогорова. Обсудить их вы можете в комментариях👇

Задача. Внутри остроугольного треугольника 𝐴𝐵𝐶, в котором ∠𝐴 = 60°, выбирается переменная точка 𝑃 так, что ∠𝐵𝑃𝐶 = 120°. Точки 𝑃₂, 𝑃₃ симметричны точке 𝑃 относительно сторон 𝐴𝐶, 𝐴𝐵 соответственно. Прямые 𝐵𝑃₂, 𝐶𝑃₃ пересекаются в точке 𝑄. Докажите, что описанная окружность треугольника 𝐴𝑃𝑄 проходит через точку, отличную от 𝐴 и не зависящую от выбора 𝑃.



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#колм

Публикуем задачи первого тура кубка Колмогорова. Обсудить их вы можете в комментариях👇

Задача. Внутри остроугольного треугольника 𝐴𝐵𝐶, в котором ∠𝐴 = 60°, выбирается переменная точка 𝑃 так, что ∠𝐵𝑃𝐶 = 120°. Точки 𝑃₂, 𝑃₃ симметричны точке 𝑃 относительно сторон 𝐴𝐶, 𝐴𝐵 соответственно. Прямые 𝐵𝑃₂, 𝐶𝑃₃ пересекаются в точке 𝑄. Докажите, что описанная окружность треугольника 𝐴𝑃𝑄 проходит через точку, отличную от 𝐴 и не зависящую от выбора 𝑃.

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Anastasia Vlasova/Getty Images He floated the idea of restricting the use of Telegram in Ukraine and Russia, a suggestion that was met with fierce opposition from users. Shortly after, Durov backed off the idea. But Telegram says people want to keep their chat history when they get a new phone, and they like having a data backup that will sync their chats across multiple devices. And that is why they let people choose whether they want their messages to be encrypted or not. When not turned on, though, chats are stored on Telegram's services, which are scattered throughout the world. But it has "disclosed 0 bytes of user data to third parties, including governments," Telegram states on its website. In February 2014, the Ukrainian people ousted pro-Russian president Viktor Yanukovych, prompting Russia to invade and annex the Crimean peninsula. By the start of April, Pavel Durov had given his notice, with TechCrunch saying at the time that the CEO had resisted pressure to suppress pages criticizing the Russian government. One thing that Telegram now offers to all users is the ability to “disappear” messages or set remote deletion deadlines. That enables users to have much more control over how long people can access what you’re sending them. Given that Russian law enforcement officials are reportedly (via Insider) stopping people in the street and demanding to read their text messages, this could be vital to protect individuals from reprisals.
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