Дано чотирикутник ABCD, в який вписано коло з центром I. Дотичні в точках А та С до описаного кола трикутника AIC перетинаються в точці Х, а дотичні в точках B та D до описаного кола трикутника BID перетинаються в точці Y. Доведіть, що точки I, X та Y лежать на одній прямій.
Дано чотирикутник ABCD, в який вписано коло з центром I. Дотичні в точках А та С до описаного кола трикутника AIC перетинаються в точці Х, а дотичні в точках B та D до описаного кола трикутника BID перетинаються в точці Y. Доведіть, що точки I, X та Y лежать на одній прямій.
Again, in contrast to Facebook, Google and Twitter, Telegram's founder Pavel Durov runs his company in relative secrecy from Dubai. If you initiate a Secret Chat, however, then these communications are end-to-end encrypted and are tied to the device you are using. That means it’s less convenient to access them across multiple platforms, but you are at far less risk of snooping. Back in the day, Secret Chats received some praise from the EFF, but the fact that its standard system isn’t as secure earned it some criticism. If you’re looking for something that is considered more reliable by privacy advocates, then Signal is the EFF’s preferred platform, although that too is not without some caveats. As a result, the pandemic saw many newcomers to Telegram, including prominent anti-vaccine activists who used the app's hands-off approach to share false information on shots, a study from the Institute for Strategic Dialogue shows. The last couple days have exemplified that uncertainty. On Thursday, news emerged that talks in Turkey between the Russia and Ukraine yielded no positive result. But on Friday, Reuters reported that Russian President Vladimir Putin said there had been some “positive shifts” in talks between the two sides. 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.
from nl
