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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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Given the pro-privacy stance of the platform, it’s taken as a given that it’ll be used for a number of reasons, not all of them good. And Telegram has been attached to a fair few scandals related to terrorism, sexual exploitation and crime. Back in 2015, Vox described Telegram as “ISIS’ app of choice,” saying that the platform’s real use is the ability to use channels to distribute material to large groups at once. Telegram has acted to remove public channels affiliated with terrorism, but Pavel Durov reiterated that he had no business snooping on private conversations. That hurt tech stocks. For the past few weeks, the 10-year yield has traded between 1.72% and 2%, as traders moved into the bond for safety when Russia headlines were ugly—and out of it when headlines improved. Now, the yield is touching its pandemic-era high. If the yield breaks above that level, that could signal that it’s on a sustainable path higher. Higher long-dated bond yields make future profits less valuable—and many tech companies are valued on the basis of profits forecast for many years in the future. The picture was mixed overseas. Hong Kong’s Hang Seng Index fell 1.6%, under pressure from U.S. regulatory scrutiny on New York-listed Chinese companies. Stocks were more buoyant in Europe, where Frankfurt’s DAX surged 1.4%. He said that since his platform does not have the capacity to check all channels, it may restrict some in Russia and Ukraine "for the duration of the conflict," but then reversed course hours later after many users complained that Telegram was an important source of information. Perpetrators of such fraud use various marketing techniques to attract subscribers on their social media channels.
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