Дана пирамида PABC. H - основание перпендикуляра из P на (ABC). D,E,F - проекции H на PA, PB, PC соответственно. O - центр описанной окружности ABC. Докажите, что OH перпендикулярна прямой пересечения (ABC) и (DEF).
Дана пирамида PABC. H - основание перпендикуляра из P на (ABC). D,E,F - проекции H на PA, PB, PC соответственно. O - центр описанной окружности ABC. Докажите, что OH перпендикулярна прямой пересечения (ABC) и (DEF).
Developing social channels based on exchanging a single message isn’t exactly new, of course. Back in 2014, the “Yo” app was launched with the sole purpose of enabling users to send each other the greeting “Yo.” In handing down the sentence yesterday, deputy judge Peter Hui Shiu-keung of the district court said that even if Ng did not post the messages, he cannot shirk responsibility as the owner and administrator of such a big group for allowing these messages that incite illegal behaviors to exist. Ng Man-ho, a 27-year-old computer technician, was convicted last month of seven counts of incitement charges after he made use of the 100,000-member Chinese-language channel that he runs and manages to post "seditious messages," which had been shut down since August 2020. How to create a business channel on Telegram? (Tutorial) Earlier, crypto enthusiasts had created a self-described “meme app” dubbed “gm” app wherein users would greet each other with “gm” or “good morning” messages. However, in September 2021, the gm app was down after a hacker reportedly gained access to the user data.
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