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дано трикутник ABC і вписану коніку з фокусами P, Q. трикутники APQ, BPQ, CPQ доповнили до гармонійних чотирикутників точками A', B', C'.

а) доведіть перспективність ABC і A'B'C'

б) доведіть що перспектор X цих трикутників належить колу (A'B'C')



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дано трикутник ABC і вписану коніку з фокусами P, Q. трикутники APQ, BPQ, CPQ доповнили до гармонійних чотирикутників точками A', B', C'.

а) доведіть перспективність ABC і A'B'C'

б) доведіть що перспектор X цих трикутників належить колу (A'B'C')

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Telegram Auto-Delete Messages in Any Chat

Some messages aren’t supposed to last forever. There are some Telegram groups and conversations where it’s best if messages are automatically deleted in a day or a week. Here’s how to auto-delete messages in any Telegram chat. You can enable the auto-delete feature on a per-chat basis. It works for both one-on-one conversations and group chats. Previously, you needed to use the Secret Chat feature to automatically delete messages after a set time. At the time of writing, you can choose to automatically delete messages after a day or a week. Telegram starts the timer once they are sent, not after they are read. This won’t affect the messages that were sent before enabling the feature.

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