Задача. На сторонах 𝐴𝐵 и 𝐴𝐶 треугольника 𝐴𝐵𝐶 выбраны точки 𝑃 и 𝑄 соответственно такие, что 𝐴𝑃 = 𝐴𝑄. На стороне 𝐵𝐶 выбраны точки 𝑅 и 𝑆 (𝐵𝑅 > 𝐵𝑆) таким образом, что ∠𝐵𝑅𝑃 = ∠𝐵𝑃𝑆 и ∠𝐶𝑆𝑄 = ∠𝐶𝑄𝑅. Докажите, что точки 𝑃, 𝑄, 𝑅, 𝑆 лежат на одной окружности.
Задача. На сторонах 𝐴𝐵 и 𝐴𝐶 треугольника 𝐴𝐵𝐶 выбраны точки 𝑃 и 𝑄 соответственно такие, что 𝐴𝑃 = 𝐴𝑄. На стороне 𝐵𝐶 выбраны точки 𝑅 и 𝑆 (𝐵𝑅 > 𝐵𝑆) таким образом, что ∠𝐵𝑅𝑃 = ∠𝐵𝑃𝑆 и ∠𝐶𝑆𝑄 = ∠𝐶𝑄𝑅. Докажите, что точки 𝑃, 𝑄, 𝑅, 𝑆 лежат на одной окружности.
"This time we received the coordinates of enemy vehicles marked 'V' in Kyiv region," it added. The SC urges the public to refer to the SC’s I nvestor Alert List before investing. The list contains details of unauthorised websites, investment products, companies and individuals. Members of the public who suspect that they have been approached by unauthorised firms or individuals offering schemes that promise unrealistic returns Oleksandra Matviichuk, a Kyiv-based lawyer and head of the Center for Civil Liberties, called Durov’s position "very weak," and urged concrete improvements. "The argument from Telegram is, 'You should trust us because we tell you that we're trustworthy,'" Maréchal said. "It's really in the eye of the beholder whether that's something you want to buy into." But Telegram says people want to keep their chat history when they get a new phone, and they like having a data backup that will sync their chats across multiple devices. And that is why they let people choose whether they want their messages to be encrypted or not. When not turned on, though, chats are stored on Telegram's services, which are scattered throughout the world. But it has "disclosed 0 bytes of user data to third parties, including governments," Telegram states on its website.
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