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Задача 51:
Автор - Пучков Пëтр

Обобщение леммы 255

P₁ и P₂ - изогонально сопряжены в треугольнике ABC. X₁ и X₂ - проекции B на AP₁ и AP₂, а Y₁ и Y₂ - проекции B на CP₁ и CP₂ соответственно.

1) Точки X₁ и X₂, Y₁ и Y₂ симметричны относительно средней линии треугольника ABC. Если P₁ и P₂ совпадают (случай инцентра), то X₁ = X₂, Y₁ = Y₂ лежат на средней линии.

2) Обобщённые точки 255 лежат на хордах педальной окружности точек P₁ и P₂. Если A₁, B₁, C₁ и A₂, B₂, C₂ - проекции точек P₁ и P₂ на стороны BC, AC и AB треугольника соответственно, то X₁ ∈ A₁B₂, X₂ ∈ A₂B₁, Y₁ ∈ B₂C₁, Y ∈ B₁C₂.



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Задача 51:
Автор - Пучков Пëтр

Обобщение леммы 255

P₁ и P₂ - изогонально сопряжены в треугольнике ABC. X₁ и X₂ - проекции B на AP₁ и AP₂, а Y₁ и Y₂ - проекции B на CP₁ и CP₂ соответственно.

1) Точки X₁ и X₂, Y₁ и Y₂ симметричны относительно средней линии треугольника ABC. Если P₁ и P₂ совпадают (случай инцентра), то X₁ = X₂, Y₁ = Y₂ лежат на средней линии.

2) Обобщённые точки 255 лежат на хордах педальной окружности точек P₁ и P₂. Если A₁, B₁, C₁ и A₂, B₂, C₂ - проекции точек P₁ и P₂ на стороны BC, AC и AB треугольника соответственно, то X₁ ∈ A₁B₂, X₂ ∈ A₂B₁, Y₁ ∈ B₂C₁, Y ∈ B₁C₂.

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For Oleksandra Tsekhanovska, head of the Hybrid Warfare Analytical Group at the Kyiv-based Ukraine Crisis Media Center, the effects are both near- and far-reaching. On December 23rd, 2020, Pavel Durov posted to his channel that the company would need to start generating revenue. In early 2021, he added that any advertising on the platform would not use user data for targeting, and that it would be focused on “large one-to-many channels.” He pledged that ads would be “non-intrusive” and that most users would simply not notice any change. Despite Telegram's origins, its approach to users' security has privacy advocates worried. Recently, Durav wrote on his Telegram channel that users' right to privacy, in light of the war in Ukraine, is "sacred, now more than ever." 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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