К сохраняющей площадь проекции — кусочек со страницы Мат. Этюдов:
https://etudes.ru/etudes/sphere-area/
(На всякий случай: там есть больше, и история с проекцией по окружностям интересная, но мы туда сейчас не пойдём.)
Rule out internet issues: Make sure your device is connected to a stable internet connection by running other apps on the same computer. When other apps work fine, connectivity issues get ruled out. Check Telegram status: When the internet is connected correctly, the next step should be to check that Telegram isn't experiencing downtime. To do that, visit the downdetector website and type in "Telegram" to see what's happening. When Telegram's status is active and there are no reported issues on downdetector, Telegram's backend is unlikely to present any issues.Give Telegram a fresh start: After ruling out internet and backend issues, give Telegram a fresh start to remove the possibility of temporary glitches that prevent you from contacting your friends. Shut down the Telegram app completely, preferably from Task Manager, and then relaunch it.
With Telegram, you can send messages, photos, videos and files of any type (doc, zip, mp3, etc), as well as create groups for up to 200,000 people or channels for broadcasting to unlimited audiences. You can write to your phone contacts and find people by their usernames. As a result, Telegram is like SMS and email combined — and can take care of all your personal or business messaging needs. In addition to this, we support end-to-end encrypted voice calls.
Telegram is a messaging app with a focus on speed and security, it’s super-fast, simple and free. You can use Telegram on all your devices at the same time — your messages sync seamlessly across any number of your phones, tablets or computers.
Telegram is for everyone who wants fast and reliable messaging and calls. Business users and small teams may like the large groups, usernames, desktop apps and powerful file sharing options. You can appoint admins with advanced tools to help these communities prosper in peace. Public groups can be joined by anyone and are powerful platforms for discussions and collecting feedback.In case you're more into pictures, Telegram has animated gif search, a state of the art photo editor, and an open sticker platform (find some cool stickers here or here). What's more, there is no need to worry about disk space on your device. With Telegram's cloud support and cache management options, Telegram can take up nearly zero space on your phone.
Unlike WhatsApp, Telegram is a cloud-based messenger with seamless sync. As a result, you can access your messages from several devices at once, including tablets and computers, and share an unlimited number of photos, videos and files (doc, zip, mp3, etc.) of up to 2 GB each. And if you don't want to store all that data on your device, you can always keep it in the cloud.Thanks to our multi-data center infrastructure and encryption, Telegram is faster and way more secure. On top of that, Telegram is free and will stay free — no ads, no subscription fees, forever.
Yes! Voice calls are currently available to users around the world.
Many modern travelers appear to struggle with managing various aspects of their finances simultaneously while abroad, such as banking, budgeting, investing, trading, and saving. It is important to have apps installed on the device that will help you carry out these necessary tasks.
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