Задача. Про выпуклый пятиугольник 𝑅𝐴𝐷𝑂𝑆 известно, что 𝑅𝑆 = 𝑆𝑂 и ∠𝐴𝑅𝑆 = ∠𝐷𝑂𝑆 = 90°. Внутри 𝑅𝐴𝐷𝑂𝑆 взята точка 𝑇 так, что 𝑅𝑇 ⊥ 𝐴𝑆 и 𝑇𝑂 ⊥ 𝐷𝑆. Докажите, что 𝑆𝑇 ⊥ 𝐴𝐷.
Задача. Про выпуклый пятиугольник 𝑅𝐴𝐷𝑂𝑆 известно, что 𝑅𝑆 = 𝑆𝑂 и ∠𝐴𝑅𝑆 = ∠𝐷𝑂𝑆 = 90°. Внутри 𝑅𝐴𝐷𝑂𝑆 взята точка 𝑇 так, что 𝑅𝑇 ⊥ 𝐴𝑆 и 𝑇𝑂 ⊥ 𝐷𝑆. Докажите, что 𝑆𝑇 ⊥ 𝐴𝐷.
The Russian invasion of Ukraine has been a driving force in markets for the past few weeks. This provided opportunity to their linked entities to offload their shares at higher prices and make significant profits at the cost of unsuspecting retail investors. Russians and Ukrainians are both prolific users of Telegram. They rely on the app for channels that act as newsfeeds, group chats (both public and private), and one-to-one communication. Since the Russian invasion of Ukraine, Telegram has remained an important lifeline for both Russians and Ukrainians, as a way of staying aware of the latest news and keeping in touch with loved ones. The fake Zelenskiy account reached 20,000 followers on Telegram before it was shut down, a remedial action that experts say is all too rare. The perpetrators use various names to carry out the investment scams. They may also impersonate or clone licensed capital market intermediaries by using the names, logos, credentials, websites and other details of the legitimate entities to promote the illegal schemes.
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