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Замкнутая четырехзвенная ломаная описана вокруг сферы. Доказать, что точки касания лежат в одной плоскости.

// П.Пушкарь напомнил такую задачу с ММО-1950



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Замкнутая четырехзвенная ломаная описана вокруг сферы. Доказать, что точки касания лежат в одной плоскости.

// П.Пушкарь напомнил такую задачу с ММО-1950

BY Геометрия-канал


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Overall, extreme levels of fear in the market seems to have morphed into something more resembling concern. For example, the Cboe Volatility Index fell from its 2022 peak of 36, which it hit Monday, to around 30 on Friday, a sign of easing tensions. Meanwhile, while the price of WTI crude oil slipped from Sunday’s multiyear high $130 of barrel to $109 a pop. Markets have been expecting heavy restrictions on Russian oil, some of which the U.S. has already imposed, and that would reduce the global supply and bring about even more burdensome inflation. 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. For Oleksandra Tsekhanovska, head of the Hybrid Warfare Analytical Group at the Kyiv-based Ukraine Crisis Media Center, the effects are both near- and far-reaching. Recently, Durav wrote on his Telegram channel that users' right to privacy, in light of the war in Ukraine, is "sacred, now more than ever." However, the perpetrators of such frauds are now adopting new methods and technologies to defraud the investors.
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