Задача. В остроугольном треугольнике 𝐴𝐵𝐶 проведены высоты 𝐵𝐷 и 𝐶𝐸. Пусть 𝐹 и 𝐺 — точки на прямой 𝐸𝐷 такие, что 𝐵𝐹 ⊥ 𝐸𝐷 и 𝐶𝐺 ⊥ 𝐸𝐷. Докажите, что 𝐸𝐹 = 𝐷𝐺.
Задача. В остроугольном треугольнике 𝐴𝐵𝐶 проведены высоты 𝐵𝐷 и 𝐶𝐸. Пусть 𝐹 и 𝐺 — точки на прямой 𝐸𝐷 такие, что 𝐵𝐹 ⊥ 𝐸𝐷 и 𝐶𝐺 ⊥ 𝐸𝐷. Докажите, что 𝐸𝐹 = 𝐷𝐺.
Ukrainian forces successfully attacked Russian vehicles in the capital city of Kyiv thanks to a public tip made through the encrypted messaging app Telegram, Ukraine's top law-enforcement agency said on Tuesday. Despite Telegram's origins, its approach to users' security has privacy advocates worried. Unlike Silicon Valley giants such as Facebook and Twitter, which run very public anti-disinformation programs, Brooking said: "Telegram is famously lax or absent in its content moderation policy." Lastly, the web previews of t.me links have been given a new look, adding chat backgrounds and design elements from the fully-features Telegram Web client. Anastasia Vlasova/Getty Images
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