Задача 55: Автор - Ким Пётр Источник: MGO 2024, задача 3
Пусть ABCD - вписанный четырёхугольник. Пусть w1 и w2 - две окружности, проходящие через A, B и C, D соответственно и пересекающиеся вне окружности (ABCD). Доказать, что если существует окружность, касающаяся AB, CD, w1, w2,то существует окружность или прямая, касающаяся BC, AD, w1, w2.
Задача 55: Автор - Ким Пётр Источник: MGO 2024, задача 3
Пусть ABCD - вписанный четырёхугольник. Пусть w1 и w2 - две окружности, проходящие через A, B и C, D соответственно и пересекающиеся вне окружности (ABCD). Доказать, что если существует окружность, касающаяся AB, CD, w1, w2,то существует окружность или прямая, касающаяся BC, AD, w1, w2.
Multiple pro-Kremlin media figures circulated the post's false claims, including prominent Russian journalist Vladimir Soloviev and the state-controlled Russian outlet RT, according to the DFR Lab's report. The company maintains that it cannot act against individual or group chats, which are “private amongst their participants,” but it will respond to requests in relation to sticker sets, channels and bots which are publicly available. During the invasion of Ukraine, Pavel Durov has wrestled with this issue a lot more prominently than he has before. Channels like Donbass Insider and Bellum Acta, as reported by Foreign Policy, started pumping out pro-Russian propaganda as the invasion began. So much so that the Ukrainian National Security and Defense Council issued a statement labeling which accounts are Russian-backed. Ukrainian officials, in potential violation of the Geneva Convention, have shared imagery of dead and captured Russian soldiers on the platform. 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. Perpetrators of such fraud use various marketing techniques to attract subscribers on their social media channels. On Feb. 27, however, he admitted from his Russian-language account that "Telegram channels are increasingly becoming a source of unverified information related to Ukrainian events."
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