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Новый год - новая задача! :)

Еще один забавный факт про описанный четырехугольник. Тут можно найти короткое хитрое решение в строчку. А можно утонуть в счете и прийти в никуда...

Окружность с центром I вписана в четырёхугольник ABCD.
(!) IAIC + IBID = sqrt(ABBCCDDA)



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Новый год - новая задача! :)

Еще один забавный факт про описанный четырехугольник. Тут можно найти короткое хитрое решение в строчку. А можно утонуть в счете и прийти в никуда...

Окружность с центром I вписана в четырёхугольник ABCD.
(!) IAIC + IBID = sqrt(ABBCCDDA)

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On Telegram’s website, it says that Pavel Durov “supports Telegram financially and ideologically while Nikolai (Duvov)’s input is technological.” Currently, the Telegram team is based in Dubai, having moved around from Berlin, London and Singapore after departing Russia. Meanwhile, the company which owns Telegram is registered in the British Virgin Islands. The Dow Jones Industrial Average fell 230 points, or 0.7%. Meanwhile, the S&P 500 and the Nasdaq Composite dropped 1.3% and 2.2%, respectively. All three indexes began the day with gains before selling off. Ukrainian forces successfully attacked Russian vehicles in the capital city of Kyiv thanks to a public tip made through the encrypted messaging app Telegram, Ukraine's top law-enforcement agency said on Tuesday. 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. False news often spreads via public groups, or chats, with potentially fatal effects.
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