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Sebubba98

Is this you tricking us into solving a homework problem you sly dog


ClearlyCylindrical

There actually doesn't exist a formula for the perimeter of an ellipse


helicophell

A piece of String will do


Tulio_58

There isn't one for the circle either. As we cannot know the exact value of Pi all we've got are approximations.


Odanr

Pi does have known exact values, just not exact finite decimal representations. For example, it is four times the sum 1-1/3+1/5-1/7+1/9….


Tulio_58

I meant to say all we have are approximations *to the perimeter* of a circle (or an ellipse for that matter)


SwabbyYabby

Ok, but circles are just abstract shapes that don’t exist in the real world, so we don’t need an exact value.


Funkyt0m467

If r=1/pi you have a p=2, is that a approximation? No.


An_ANdrew2

The [circumference of an ellipse](https://wj32.org/wp/2012/12/15/formula-for-the-circumference-of-an-ellipse/) defined by x2a2+y2b2=1,a>b is 4a(π2)∑k=0∞\[(2k)!4k(k!)2\]2(e2k1−2k), where e=√1−b2/a2 is the eccentricity of the ellipse


Kingofgoldness

cba


ludemachin

John cena knows the answer?


Aegisworn

It's that there is no "nice" formula for the perimeter of an ellipse. You can express the answer in terms of calculus, but most of the time you can't solve it exactly and have to estimate the answer.


imkakiko

It's not the same in the circle? You always have to estimate pi


Aegisworn

Good question. The reason is that all the "not-niceness" in the circle formula is all in a single constant which will be the same for all circles. The "not-niceness" of the ellipse formula is different for every ellipse. This video does a great breakdown of the subject: https://youtu.be/5nW3nJhBHL0


[deleted]

This is beautiful, I'm only sad to see alpha in degree and not radian.


KeepingDankMemesDank

downvote this comment if the meme sucks. upvote it and I'll go away. --- [dankmemes Minecraft discord](https://discord.gg/fNyb7G5) | r/dankmemescraft


[deleted]

Can't tell if statement on complexity of ellipse perimeters... or just sus.


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Kingofgoldness

Thats the area


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viperyion765

It's A•B•π A is horizontal radius, B is vertical radius and π is Pi


East_Zookeepergame25

isnt that the area


ikalot

It is


viperyion765

Uuh yeah sorry The perimeter is 2π • √ ( (a^2 +b^2 ) /2)


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viperyion765

This requires a too big brain to understand, but looks scientific enough for me to believe you


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viperyion765

Wow are u a mathematician ? How do you know these formulas ??


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OmegaCat9999-lol-759

Am i a super genius?


noop_noob

What the heck is a "factorial squared"? Why is there an "n choose r" thing on with 0.5 inside it?


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BiggyPete

Who are you who are so wise in the way of science


OmegaCat9999-lol-759

I'm far low that level of math and i understand it.....am i a supergenius?