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Задача. Дан квадрат 𝐴𝐵𝐶𝐷. Точки 𝑃 и 𝑄 лежат на 𝐴𝐵 и 𝐵𝐶 соответственно так, что 𝐵𝑃 = 𝐵𝑄. Пусть 𝐻 — основание перпендикуляра из точки 𝐵 на отрезок 𝑃𝐶. Докажите, что ∠𝐷𝐻𝑄 = 90°.
Задачка имеет чисто геометрическое решение без всяких отношений отрезков и, уж тем более, без декартов!
Желаем вам нестандартных и соломоновых решений сегодня 👨🎓
Задача. Дан квадрат 𝐴𝐵𝐶𝐷. Точки 𝑃 и 𝑄 лежат на 𝐴𝐵 и 𝐵𝐶 соответственно так, что 𝐵𝑃 = 𝐵𝑄. Пусть 𝐻 — основание перпендикуляра из точки 𝐵 на отрезок 𝑃𝐶. Докажите, что ∠𝐷𝐻𝑄 = 90°.
Задачка имеет чисто геометрическое решение без всяких отношений отрезков и, уж тем более, без декартов!
Желаем вам нестандартных и соломоновых решений сегодня 👨🎓
As the war in Ukraine rages, the messaging app Telegram has emerged as the go-to place for unfiltered live war updates for both Ukrainian refugees and increasingly isolated Russians alike. "There are several million Russians who can lift their head up from propaganda and try to look for other sources, and I'd say that most look for it on Telegram," he said. "There is a significant risk of insider threat or hacking of Telegram systems that could expose all of these chats to the Russian government," said Eva Galperin with the Electronic Frontier Foundation, which has called for Telegram to improve its privacy practices. 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. Official government accounts have also spread fake fact checks. An official Twitter account for the Russia diplomatic mission in Geneva shared a fake debunking video claiming without evidence that "Western and Ukrainian media are creating thousands of fake news on Russia every day." The video, which has amassed almost 30,000 views, offered a "how-to" spot misinformation.
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