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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 👨🎓
Telegram does offer end-to-end encrypted communications through Secret Chats, but this is not the default setting. Standard conversations use the MTProto method, enabling server-client encryption but with them stored on the server for ease-of-access. This makes using Telegram across multiple devices simple, but also means that the regular Telegram chats you’re having with folks are not as secure as you may believe. Although some channels have been removed, the curation process is considered opaque and insufficient by analysts. In a statement, the regulator said the search and seizure operation was carried out against seven individuals and one corporate entity at multiple locations in Ahmedabad and Bhavnagar in Gujarat, Neemuch in Madhya Pradesh, Delhi, and Mumbai. In the United States, Telegram's lower public profile has helped it mostly avoid high level scrutiny from Congress, but it has not gone unnoticed. Artem Kliuchnikov and his family fled Ukraine just days before the Russian invasion.
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