В треугольнике ABC проведены высоты AD, BE и CF. Точка A' лежит на (ABC) и такова, что AA'||BC. Точка K - пересечение (ABC) и (A'FE), отличное от A'. Докажите, что медиана AM треугольника ABC и прямая KD пересекаются на (ABC).
В треугольнике ABC проведены высоты AD, BE и CF. Точка A' лежит на (ABC) и такова, что AA'||BC. Точка K - пересечение (ABC) и (A'FE), отличное от A'. Докажите, что медиана AM треугольника ABC и прямая KD пересекаются на (ABC).
Telegram was founded in 2013 by two Russian brothers, Nikolai and Pavel Durov. "There are several million Russians who can lift their head up from propaganda and try to look for other sources, and I'd say that most look for it on Telegram," he said. Some privacy experts say Telegram is not secure enough Emerson Brooking, a disinformation expert at the Atlantic Council's Digital Forensic Research Lab, said: "Back in the Wild West period of content moderation, like 2014 or 2015, maybe they could have gotten away with it, but it stands in marked contrast with how other companies run themselves today." If you initiate a Secret Chat, however, then these communications are end-to-end encrypted and are tied to the device you are using. That means it’s less convenient to access them across multiple platforms, but you are at far less risk of snooping. Back in the day, Secret Chats received some praise from the EFF, but the fact that its standard system isn’t as secure earned it some criticism. If you’re looking for something that is considered more reliable by privacy advocates, then Signal is the EFF’s preferred platform, although that too is not without some caveats.
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