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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 👨🎓
It is unclear who runs the account, although Russia's official Ministry of Foreign Affairs Twitter account promoted the Telegram channel on Saturday and claimed it was operated by "a group of experts & journalists." "Your messages about the movement of the enemy through the official chatbot … bring new trophies every day," the government agency tweeted. At the start of 2018, the company attempted to launch an Initial Coin Offering (ICO) which would enable it to enable payments (and earn the cash that comes from doing so). The initial signals were promising, especially given Telegram’s user base is already fairly crypto-savvy. It raised an initial tranche of cash – worth more than a billion dollars – to help develop the coin before opening sales to the public. Unfortunately, third-party sales of coins bought in those initial fundraising rounds raised the ire of the SEC, which brought the hammer down on the whole operation. In 2020, officials ordered Telegram to pay a fine of $18.5 million and hand back much of the cash that it had raised. "This time we received the coordinates of enemy vehicles marked 'V' in Kyiv region," it added. The Securities and Exchange Board of India (Sebi) had carried out a similar exercise in 2017 in a matter related to circulation of messages through WhatsApp.
from fr
