this post was submitted on 14 Mar 2025
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They're both useful, a cricle's circumference as τr is lovely but πr2 is certainly more elegant for area. The real pity is that they didn't use the symbols the other way round - if τ = 3.1... and π =6.2... you have a natural π =τ+τ which makes sense (visually, conventionally mathematically it's nonsense!)