Telegram Group & Telegram Channel
скучні задачі
задача від @mamonovclhgffkuffhj (!) існує коло що дотикається до описаного і гіперболи жерабека і проходить через ортоцентр і центр описаного кола
ну і ось лема за тим же авторством, яку я згадав в коментарях.
сині точки P, Q ізогональні. через них і вершини проведено коніку (ABCPQ), точка перетину U якої з описаним колом (ABC), що відрізняється від вершин. через U провели довільну пряму, яка перетинає (ABC) в R і (ABCPQ) в S.

(!) доведіть вписаність чотирикутника PQRS



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ну і ось лема за тим же авторством, яку я згадав в коментарях.
сині точки P, Q ізогональні. через них і вершини проведено коніку (ABCPQ), точка перетину U якої з описаним колом (ABC), що відрізняється від вершин. через U провели довільну пряму, яка перетинає (ABC) в R і (ABCPQ) в S.

(!) доведіть вписаність чотирикутника PQRS

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Telegram | DID YOU KNOW?

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Additionally, investors are often instructed to deposit monies into personal bank accounts of individuals who claim to represent a legitimate entity, and/or into an unrelated corporate account. To lend credence and to lure unsuspecting victims, perpetrators usually claim that their entity and/or the investment schemes are approved by financial authorities. At this point, however, Durov had already been working on Telegram with his brother, and further planned a mobile-first social network with an explicit focus on anti-censorship. Later in April, he told TechCrunch that he had left Russia and had “no plans to go back,” saying that the nation was currently “incompatible with internet business at the moment.” He added later that he was looking for a country that matched his libertarian ideals to base his next startup. 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." He floated the idea of restricting the use of Telegram in Ukraine and Russia, a suggestion that was met with fierce opposition from users. Shortly after, Durov backed off the idea. 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.
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Telegram скучні задачі
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