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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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