TIL that there is no formula for the exact perimeter of an ellipse, but that you could make an arbitrarily close approximation of a formula for the perimeter of a *given* ellipse, and that such a formula would depend on the sum of an infinite series.

TIL that this is technically how we have a formula for the perimeter of a circle, but don't notice the messiness because the circle's "axes" are of equal length and thus a single sum of an infinite series works. We call it "pi" to keep it unmessy.

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Oh, heavens. This has already been favorited and boosted more times than any other toot I've made. It's sure to hit some real mathematician who's bound to tell me how I'm wrong wrong wrong. To that future person, I am apologizing in advance. I fake all my math.

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