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Bulgaria MO, 1999, Problem 2

На картинке два подобных треугольника. O и H — центр описанной окружности и ортоцентр маленького, H' — ортоцентр большого. Докажите, что OH=OH'.



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Bulgaria MO, 1999, Problem 2

На картинке два подобных треугольника. O и H — центр описанной окружности и ортоцентр маленького, H' — ортоцентр большого. Докажите, что OH=OH'.

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"Your messages about the movement of the enemy through the official chatbot … bring new trophies every day," the government agency tweeted. Right now the digital security needs of Russians and Ukrainians are very different, and they lead to very different caveats about how to mitigate the risks associated with using Telegram. For Ukrainians in Ukraine, whose physical safety is at risk because they are in a war zone, digital security is probably not their highest priority. They may value access to news and communication with their loved ones over making sure that all of their communications are encrypted in such a manner that they are indecipherable to Telegram, its employees, or governments with court orders. The perpetrators use various names to carry out the investment scams. They may also impersonate or clone licensed capital market intermediaries by using the names, logos, credentials, websites and other details of the legitimate entities to promote the illegal schemes. Just days after Russia invaded Ukraine, Durov wrote that Telegram was "increasingly becoming a source of unverified information," and he worried about the app being used to "incite ethnic hatred." READ MORE
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