Через две вершины вписанного четырёхугольника провели произвольную окружность ω. Из двух других вершин провели к ней касательные. (!) Для любой окружности ω прямая через точки касания проходит через фиксированную точку
Через две вершины вписанного четырёхугольника провели произвольную окружность ω. Из двух других вершин провели к ней касательные. (!) Для любой окружности ω прямая через точки касания проходит через фиксированную точку
The Security Service of Ukraine said in a tweet that it was able to effectively target Russian convoys near Kyiv because of messages sent to an official Telegram bot account called "STOP Russian War." The next bit isn’t clear, but Durov reportedly claimed that his resignation, dated March 21st, was an April Fools’ prank. TechCrunch implies that it was a matter of principle, but it’s hard to be clear on the wheres, whos and whys. Similarly, on April 17th, the Moscow Times quoted Durov as saying that he quit the company after being pressured to reveal account details about Ukrainians protesting the then-president Viktor Yanukovych. Russian President Vladimir Putin launched Russia's invasion of Ukraine in the early-morning hours of February 24, targeting several key cities with military strikes. The channel appears to be part of the broader information war that has developed following Russia's invasion of Ukraine. The Kremlin has paid Russian TikTok influencers to push propaganda, according to a Vice News investigation, while ProPublica found that fake Russian fact check videos had been viewed over a million times on Telegram. Some privacy experts say Telegram is not secure enough
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