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Пятиугольник ABCDE вписан в окружность.

(!) Точки Эйлера четырёхугольников ABCD, ABCE, ABDE, ACDE, BCDE лежат на одной окружности вдвое меньшего радиуса

Точкой Эйлера четырёхугольника ABCD назывaется точка пересечения окружностей Эйлера треугольников ABC, ABD, ACD, BCD



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Пятиугольник ABCDE вписан в окружность.

(!) Точки Эйлера четырёхугольников ABCD, ABCE, ABDE, ACDE, BCDE лежат на одной окружности вдвое меньшего радиуса

Точкой Эйлера четырёхугольника ABCD назывaется точка пересечения окружностей Эйлера треугольников ABC, ABD, ACD, BCD

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At this point, however, Durov had already been working on Telegram with his brother, and further planned a mobile-first social network with an explicit focus on anti-censorship. Later in April, he told TechCrunch that he had left Russia and had “no plans to go back,” saying that the nation was currently “incompatible with internet business at the moment.” He added later that he was looking for a country that matched his libertarian ideals to base his next startup. As a result, the pandemic saw many newcomers to Telegram, including prominent anti-vaccine activists who used the app's hands-off approach to share false information on shots, a study from the Institute for Strategic Dialogue shows. A Russian Telegram channel with over 700,000 followers is spreading disinformation about Russia's invasion of Ukraine under the guise of providing "objective information" and fact-checking fake news. Its influence extends beyond the platform, with major Russian publications, government officials, and journalists citing the page's posts. Perpetrators of these scams will create a public group on Telegram to promote these investment packages that are usually accompanied by fake testimonies and sometimes advertised as being Shariah-compliant. Interested investors will be asked to directly message the representatives to begin investing in the various investment packages offered. But because group chats and the channel features are not end-to-end encrypted, Galperin said user privacy is potentially under threat.
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