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В неравностороннем треугольнике ABC I – центр вписанной, O – центр описанной окружностей. Прямая λ проходит через точку I перпендикулярно OI. Прямая, симметричная прямой BC относительно λ пересекает AB и AC а точках K и L. Докажите, что центр окружности AKL лежит на прямой OI.
В неравностороннем треугольнике ABC I – центр вписанной, O – центр описанной окружностей. Прямая λ проходит через точку I перпендикулярно OI. Прямая, симметричная прямой BC относительно λ пересекает AB и AC а точках K и L. Докажите, что центр окружности AKL лежит на прямой OI.
"We as Ukrainians believe that the truth is on our side, whether it's truth that you're proclaiming about the war and everything else, why would you want to hide it?," he said. In addition, Telegram's architecture limits the ability to slow the spread of false information: the lack of a central public feed, and the fact that comments are easily disabled in channels, reduce the space for public pushback. You may recall that, back when Facebook started changing WhatsApp’s terms of service, a number of news outlets reported on, and even recommended, switching to Telegram. Pavel Durov even said that users should delete WhatsApp “unless you are cool with all of your photos and messages becoming public one day.” But Telegram can’t be described as a more-secure version of WhatsApp. Groups are also not fully encrypted, end-to-end. This includes private groups. Private groups cannot be seen by other Telegram users, but Telegram itself can see the groups and all of the communications that you have in them. All of the same risks and warnings about channels can be applied to groups. Individual messages can be fully encrypted. But the user has to turn on that function. It's not automatic, as it is on Signal and WhatsApp.
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