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Apr 23, 2020 at 0:15 comment added Gerry Myerson @Ezio the discussion at math.stackexchange.com/questions/1791063/… might interest you. Or math.stackexchange.com/questions/1078377/… or math.stackexchange.com/questions/1303044/… or probably many other related questions over there.
Apr 22, 2020 at 21:51 comment added Kugutsu-o OK good answer, still, I would love if there was a way to somehow define an infinite series that would compute the area or circumference of a circle without using sine, unless one can define and relate sine to geometry without coordinates.
Apr 22, 2020 at 20:37 history answered Carlo Beenakker CC BY-SA 4.0