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Q150: ABCD is a square with side a. In centres A,B,C and D four circles are drawn such that each circle touches externally the remaining three circles. Let δ be the area interior of the square and exterior of the circles. What is the value of δ?
Anonymous Quiz
a²(1 - π)
a²[(4 - π) ÷ 4]
a²(π - 1)
(πa²) ÷ 4
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Mr. Durov launched Telegram in late 2013 with his brother, Nikolai, just months before he was pushed out of VK, the Russian social-media platform he founded. Mr. Durov pitched his new app—funded with the proceeds from the VK sale—less as a business than as a way for people to send messages while avoiding government surveillance and censorship.

Telegram announces Anonymous Admins

The cloud-based messaging platform is also adding Anonymous Group Admins feature. As per Telegram, this feature is being introduced for safer protests. As per the Telegram blog post, users can “Toggle Remain Anonymous in Admin rights to enable Batman mode. The anonymized admin will be hidden in the list of group members, and their messages in the chat will be signed with the group name, similar to channel posts.”

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