# Thread: Find the perimeter of an eClipse

1. Senior Member
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Apr 2019
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## Find the perimeter of an eClipse

Matt Parker made a video about why there's no well-defined equation for calculating the perimeter of an ellipse.

I think a /k/ slipped in at 5:00, making him accidentally say eclipse instead of ellipse. Am I right?

2. Moderator
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Dec 2015
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Yes.

3. ## Re: Find the perimeter of an eClipse

Although it is not part of elementary mathematics (because it uses integral calculus) there does indeed seem to be a formula for the circumference of an ellipse. See:

https://proofwiki.org/wiki/Perimeter...2%CE%B8d%CE%B8
Last edited by probus; 04-May-2021 at 01:41. Reason: Fix typos

4. Senior Member
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## Re: Find the perimeter of an eClipse

Calculus can calculate any otherwise-uncalculatable object, no matter the shape or how non-Euclidian it is. The video is about there not being a neat formula, like the ones we have for many other geometric objects.

"Seducing a woman is like the cotangent function. No matter how close I get, I can never quite touch the pi." - Sir Isaac Newton, inventor of calculus, died a virgin.

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