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.
On Feb. 27, however, he admitted from his Russian-language account that "Telegram channels are increasingly becoming a source of unverified information related to Ukrainian events." Stocks closed in the red Friday as investors weighed upbeat remarks from Russian President Vladimir Putin about diplomatic discussions with Ukraine against a weaker-than-expected print on U.S. consumer sentiment. I want a secure messaging app, should I use Telegram? 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. One thing that Telegram now offers to all users is the ability to “disappear” messages or set remote deletion deadlines. That enables users to have much more control over how long people can access what you’re sending them. Given that Russian law enforcement officials are reportedly (via Insider) stopping people in the street and demanding to read their text messages, this could be vital to protect individuals from reprisals.
from id
