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when toggle format what by license comment
Aug 9, 2017 at 3:42 comment added Nicolas Raoul @user1717828: I am sure it is meant to be a filled pyramid, with no concave part.
Aug 8, 2017 at 21:13 comment added Spirine What do you mean by the concave side ?
Aug 8, 2017 at 17:56 comment added user1717828 Wouldn't the concave side still be ~50% of the paper's surface area, though?
Aug 7, 2017 at 19:55 history answered Spirine CC BY-SA 3.0