Well, title. Who chose the letter? I was thinking ancient Greeks (Euclidean? Pythagoras?) or was it chosen later on? Why did it stick and was not replaced like so many others?
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In Greek, perimeter is written περίμετρος, which starts with π. However, for the perimeter of a whole circle, we usually write it as τ=2π. Why mathematicians have committed to having the perimeter of a circle be 2π is beyond me.
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