## 1184: "Circumference Formula"

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kelvinc
Posts: 35
Joined: Wed Aug 27, 2008 11:24 pm UTC

### 1184: "Circumference Formula"

Alt: Assume r' refers to the radius of Earth Prime, and r'' means radius in inches.

The simple jokes are best. Always preferred the single panel silliness to the longer set-up to punchlines.
Last edited by kelvinc on Mon Mar 11, 2013 4:22 am UTC, edited 2 times in total.

rhomboidal
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### Re: 1184: "Circumference Formula"

r''' means batteries and clarity not included.

Derian
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### Re: 1184: "Circumference Formula"

This made me die a little inside

orangustang
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### Re: 1184: "Circumference Formula"

Of course, r''' is the second derivative of the radius of Earth Prime.

Coyne
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### Re: 1184: "Circumference Formula"

All I could think of when I saw the tooltip was, "Why is r' for Earth Prime and r" for inches, instead of r' being in feet, and r" in seconds?"
In all fairness...

Coyne
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### Re: 1184: "Circumference Formula"

My second thought lead me to check the Wikipedia Circle article, to see if someone was actually lame enough to footnote the formula.
In all fairness...

rpresser
Posts: 16
Joined: Wed Oct 11, 2006 8:49 pm UTC

### Re: 1184: "Circumference Formula"

Ryan's a few dozen years late with this. See "Mathmanship" by Nicholas Vanserg (1958):

The other side of the asterisk gambit is to use a superscript as a key to a real footnote. The knowledge‐seeker
reads that S is –36.714 calories and thinks "Gee what a whale of a lot of calories" until he reads to the bottom of
the page, finds footnote 14 and says "oh."

(Vanserg was actually a psuedonym.)

glasnt
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### Re: 1184: "Circumference Formula"

I'm not sure if this is exceedingly clever, or just nerdy. Or both. So conflicted.

firinne
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### Re: 1184: "Circumference Formula"

.........I stared at it for twenty seconds going no wait what that can't be right i don't get it

then I noticed the footnote -_-;

Milnoc
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### Re: 1184: "Circumference Formula"

Almost lost my mind there for a moment...

RAGBRAIvet
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### Re: 1184: "Circumference Formula"

You know, the same formula can be expressed as πD (where "D" is diameter of the circle).  No footnote needed.
For that matter, since when did common formulae require footnotes to explain the accepted standard symbols for constants and variables?

alvinhochun
Posts: 54
Joined: Wed Nov 14, 2012 3:07 pm UTC

### Re: 1184: "Circumference Formula"

Coyne wrote:My second thought lead me to check the Wikipedia Circle article, to see if someone was actually lame enough to footnote the formula.

Wait I still don't see any xkcd vandalism. Perhaps it is a bit difficult to add footnote to an equation?

da Doctah
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### Re: 1184: "Circumference Formula"

Lately I've been seeing a lot of news articles on the web saying inane things like "Astronomers now believe there may be as many as 31023 stars in the universe", where both the × symbol and the markup for the exponentiation have been lost in the cutting and pasting.

Kit.
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### Re: 1184: "Circumference Formula"

"The circle's radius" is not plausible as a footnote.

"Or πd" could do, though.

jackal
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Joined: Fri Apr 15, 2011 4:16 am UTC

### Re: 1184: "Circumference Formula"

RAGBRAIvet wrote:You know, the same formula can be expressed as πD (where "D" is diameter of the circle).  No footnote needed.
For that matter, since when did common formulae require footnotes to explain the accepted standard symbols for constants and variables?

Then it would just be πD3.

3The circle's diameter

orthogon
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### Re: 1184: "Circumference Formula"

da Doctah wrote:Lately I've been seeing a lot of news articles on the web saying inane things like "Astronomers now believe there may be as many as 31023 stars in the universe", where both the × symbol and the markup for the exponentiation have been lost in the cutting and pasting.

Grr. My favourite newspaper insists on using Coulombs as a unit of temperature, e.g. "Temperatures in parts of the UK dropped to -5C last night".
xtifr wrote:... and orthogon merely sounds undecided.

myxiplx
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### Re: 1184: "Circumference Formula"

As a former student of mathematics, I would just like to say GGAAAAAAHHHHHH!!!!!

It's the maths equivalent of fingernails on a chalkboard, I can still feel it. GGAAAAAAHHHHHH!!!!!

Plasma_Wolf
Posts: 144
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### Re: 1184: "Circumference Formula"

As a current student of mathematics, I would just like to say I love it. It's a simple joke, but a very good one.

JoSch
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Joined: Mon Sep 19, 2011 12:03 pm UTC

### Re: 1184: "Circumference Formula"

As someone who never was a student of mathematics (but had the great pleasure to have to attend a shitload of math courses, including my most beloved "vector analysis") and has no intent of ever becoming one, I must say that I found it a little amusing.

oliphaunt
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### Re: 1184: "Circumference Formula"

"Earth prime"... is that the moon? (Seeing as prime/secundus/etc are usually used to indicate the nth body orbiting another body.)
ylno thgir ot tfel morf txet siht daer esaelp

TheEngineer
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### Re: 1184: "Circumference Formula"

I get a smug feeling now I know that the area of my land is πr22

Antior
Posts: 61
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### Re: 1184: "Circumference Formula"

oliphaunt wrote:"Earth prime"... is that the moon? (Seeing as prime/secundus/etc are usually used to indicate the nth body orbiting another body.)

In shows and stories that use 'parallel universes' such as Sliders, the original earth we all know and love is often called 'Earth prime'. But I don't know if the comic is referring to that.

Also, this made my math hurt.

RAGBRAIvet
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### Re: 1184: "Circumference Formula"

Two pi r square?  Nonsense!!
Two pi r round.  CORNBREAD r square!

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### Re: 1184: "Circumference Formula"

da Doctah wrote:Lately I've been seeing a lot of news articles on the web saying inane things like "Astronomers now believe there may be as many as 31023 stars in the universe", where both the × symbol and the markup for the exponentiation have been lost in the cutting and pasting.

Write it as "Astronomers now believe there may be more than 31023 stars in the universe" and it's still correct, although admittedly a little bit uninformative
It's one of those irregular verbs, isn't it? I have an independent mind, you are an eccentric, he is round the twist
- Bernard Woolley in Yes, Prime Minister

hordriss
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### Re: 1184: "Circumference Formula"

In the age of the colour printer, why don't we have an agreed colour scheme for academic documents? We more or less managed it for html links. You could make references a particular colour, but you would have to design it to accomodate things like colour blindness and human eye sensitivity, especially with regards to reading.
Or you could just put them in a box or a ⓑⓤⓑⓑⓛⓔ.

(whistles innocently) ¸¸.•*¨*•♫♪

peewee_RotA
Posts: 504
Joined: Mon Dec 12, 2011 1:19 pm UTC

### Re: 1184: "Circumference Formula"

What do you say to a baker who can’t find his circumference?

Tell him where his 2 pies are.
"Vowels have trouble getting married in Canada. They can’t pronounce their O’s."

Klear
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Location: Prague

### Re: 1184: "Circumference Formula"

This reminds me of the signature of duckshirt here on the forums:

duckshirt wrote:2-1=0! For real!

ejrb
Posts: 1
Joined: Mon Mar 11, 2013 11:17 am UTC

### Re: 1184: "Circumference Formula"

Should it not be

Circumference1 of a circle2:

23π4r5

1 Length of the path that bounds a round shape shape
2 OED: a plane figure bounded by a single curved line which is everywhere equally distant from a point within
3 A number; one more than one.
4 A number slightly more than one more than one6 more than one. Appears as the ratio of different aspects of circles: See Circumference of a circle
5 The distance from the centre of a circle to the edge of the circle
6 See 3

sonalita
Posts: 12
Joined: Wed Oct 20, 2010 11:06 am UTC

### Re: 1184: "Circumference Formula"

RAGBRAIvet wrote:You know, the same formula can be expressed as πD (where "D" is diameter of the circle).  No footnote needed.
For that matter, since when did common formulae require footnotes to explain the accepted standard symbols for constants and variables?

Nice to see that your humor bypass surgery was successful.

nlitchfield
Posts: 16
Joined: Mon Mar 07, 2011 1:25 pm UTC

### Re: 1184: "Circumference Formula"

Desperately needs a citation - Google only turns up this discussion for that one. Mind you I'd be more interested in the Astronomer who *didn't* believe there were as many as 31023 stars in the Universe.
da Doctah wrote:Lately I've been seeing a lot of news articles on the web saying inane things like "Astronomers now believe there may be as many as 31023 stars in the universe", where both the × symbol and the markup for the exponentiation have been lost in the cutting and pasting.

Iranon
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Joined: Wed Jul 28, 2010 6:30 am UTC

### Re: 1184: "Circumference Formula"

Ouch, this hits close to home.
I've gotten used to notation being horribly butchered in the social sciences, to the point where reading things as intended is the hardest part of most problems.
LEGO won't be ready for the average user until it comes pre-assembled, in a single unified theme, and glued together so it doesn't come apart.

Sandman81
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Joined: Mon Mar 11, 2013 12:24 pm UTC

### Re: 1184: "Circumference Formula"

Reminds me of another joke.

Assume that radius of a pizza is z and depth of a pizza is a.

The volume of the pizza is pizza

rmsgrey
Posts: 3633
Joined: Wed Nov 16, 2011 6:35 pm UTC

### Re: 1184: "Circumference Formula"

Antior wrote:
oliphaunt wrote:"Earth prime"... is that the moon? (Seeing as prime/secundus/etc are usually used to indicate the nth body orbiting another body.)

In shows and stories that use 'parallel universes' such as Sliders, the original earth we all know and love is often called 'Earth prime'. But I don't know if the comic is referring to that.

Also, this made my math hurt.

In DC Comics, "Earth Prime" is, more-or-less, the real world, where the comics are written and published. I say "more-or-less" because DC characters have been known to visit Earth Prime with their powers intact, which argues that the laws of physics are not quite as rigid there as here...

gwrankin
Posts: 1
Joined: Mon Mar 11, 2013 1:20 pm UTC

### Re: 1184: "Circumference Formula"

'Earth Prime' made me immediately think of Sliders. And for that I thank you.

ctdonath
Posts: 198
Joined: Wed Feb 08, 2012 2:40 pm UTC

### Re: 1184: "Circumference Formula"

C = τr

You must read the τ Manifesto.

jrkelly
Posts: 8
Joined: Thu Apr 05, 2012 1:40 pm UTC

### Re: 1184: "Circumference Formula"

Sandman81 wrote:Reminds me of another joke.

Assume that radius of a pizza is z and depth of a pizza is a.

The volume of the pizza is pizza

May sound like a joke but this is how I taught my son to remember how to calculate the volume of a cylinder for his GCSEs

jpvlsmv
Posts: 85
Joined: Wed Jan 09, 2013 9:43 pm UTC

### Re: 1184: "Circumference Formula"

I don't know which I hate more-- unreferenced footnotes or undereferenced2 footnotes.

--Joe
[1] i.e. this one.

Rotherian
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### Re: 1184: "Circumference Formula"

oliphaunt wrote:"Earth prime"... is that the moon? (Seeing as prime/secundus/etc are usually used to indicate the nth body orbiting another body.)

It has been a while since I took Discrete Mathematics, so some of my terminology might be in error, but if I remember correctly the
'
symbol denotes a prime derivative of a function and the
"
symbol denotes a second derivative of a function.

So the cognitive dissonance created by the misuse of the terminology is where the humor lies.

tl;dr - We have been successfully trolled. (u mad bro?) O.o
There are two general categories of opinion: regular opinions and informed opinions.
Please do not argue with me unless your opinion falls into the latter category.

San Fran Sam
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### Re: 1184: "Circumference Formula"

I'm still looking for the first footnote.

Bellomy
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Joined: Fri Nov 30, 2012 5:20 am UTC

### Re: 1184: "Circumference Formula"

I'm sorry, I know I'm an idiot, but...I honestly don't get it.