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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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The Securities and Exchange Board of India (Sebi) had carried out a similar exercise in 2017 in a matter related to circulation of messages through WhatsApp. "There are a lot of things that Telegram could have been doing this whole time. And they know exactly what they are and they've chosen not to do them. That's why I don't trust them," she said. "He has to start being more proactive and to find a real solution to this situation, not stay in standby without interfering. It's a very irresponsible position from the owner of Telegram," she said. Pavel Durov, Telegram's CEO, is known as "the Russian Mark Zuckerberg," for co-founding VKontakte, which is Russian for "in touch," a Facebook imitator that became the country's most popular social networking site. There was another possible development: Reuters also reported that Ukraine said that Belarus could soon join the invasion of Ukraine. However, the AFP, citing a Pentagon official, said the U.S. hasn’t yet seen evidence that Belarusian troops are in Ukraine.
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