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1) Существует ли тетраэдр, основания высот которого не принадлежат граням? 2) Существует ли выпуклый многогранник и точка внутри такая, что основания всех перпендикуляров, опущенных из нее на грани, не принадлежат граням?
1) Существует ли тетраэдр, основания высот которого не принадлежат граням? 2) Существует ли выпуклый многогранник и точка внутри такая, что основания всех перпендикуляров, опущенных из нее на грани, не принадлежат граням?
BY Геометрия с Ниловым
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So, uh, whenever I hear about Telegram, it’s always in relation to something bad. What gives? The Russian invasion of Ukraine has been a driving force in markets for the past few weeks. Russians and Ukrainians are both prolific users of Telegram. They rely on the app for channels that act as newsfeeds, group chats (both public and private), and one-to-one communication. Since the Russian invasion of Ukraine, Telegram has remained an important lifeline for both Russians and Ukrainians, as a way of staying aware of the latest news and keeping in touch with loved ones. The last couple days have exemplified that uncertainty. On Thursday, news emerged that talks in Turkey between the Russia and Ukraine yielded no positive result. But on Friday, Reuters reported that Russian President Vladimir Putin said there had been some “positive shifts” in talks between the two sides. In a message on his Telegram channel recently recounting the episode, Durov wrote: "I lost my company and my home, but would do it again – without hesitation."
from tr
