1184: "Circumference Formula"

This forum is for the individual discussion thread that goes with each new comic.

Moderators: Moderators General, Prelates, Magistrates

kelvinc
Posts: 33
Joined: Wed Aug 27, 2008 11:24 pm UTC

1184: "Circumference Formula"

Postby kelvinc » Mon Mar 11, 2013 4:14 am UTC

Image

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.

User avatar
rhomboidal
Posts: 762
Joined: Wed Jun 15, 2011 5:25 pm UTC
Contact:

Re: 1184: "Circumference Formula"

Postby rhomboidal » Mon Mar 11, 2013 4:18 am UTC

r''' means batteries and clarity not included.

Derian
Posts: 1
Joined: Mon Mar 11, 2013 4:17 am UTC

Re: 1184: "Circumference Formula"

Postby Derian » Mon Mar 11, 2013 4:19 am UTC

This made me die a little inside :(

User avatar
orangustang
Posts: 29
Joined: Fri Dec 16, 2011 6:45 am UTC
Location: Richmond, VA
Contact:

Re: 1184: "Circumference Formula"

Postby orangustang » Mon Mar 11, 2013 4:21 am UTC

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

User avatar
Coyne
Posts: 922
Joined: Fri Dec 18, 2009 12:07 am UTC
Location: Orlando, Florida
Contact:

Re: 1184: "Circumference Formula"

Postby Coyne » Mon Mar 11, 2013 4:31 am UTC

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...

User avatar
Coyne
Posts: 922
Joined: Fri Dec 18, 2009 12:07 am UTC
Location: Orlando, Florida
Contact:

Re: 1184: "Circumference Formula"

Postby Coyne » Mon Mar 11, 2013 4:34 am UTC

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"

Postby rpresser » Mon Mar 11, 2013 4:56 am UTC

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.)

User avatar
glasnt
Posts: 539
Joined: Fri Jan 25, 2008 5:18 am UTC
Location: SQUEE!

Re: 1184: "Circumference Formula"

Postby glasnt » Mon Mar 11, 2013 5:03 am UTC

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

firinne
Posts: 86
Joined: Fri Jul 18, 2008 6:40 pm UTC

Re: 1184: "Circumference Formula"

Postby firinne » Mon Mar 11, 2013 5:07 am UTC

.........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
Posts: 24
Joined: Mon May 07, 2012 4:43 am UTC

Re: 1184: "Circumference Formula"

Postby Milnoc » Mon Mar 11, 2013 5:25 am UTC

Almost lost my mind there for a moment...

User avatar
RAGBRAIvet
Posts: 116
Joined: Tue Apr 05, 2011 12:50 pm UTC
Location: 43° 53' 03" -91° 14' 06"

Re: 1184: "Circumference Formula"

Postby RAGBRAIvet » Mon Mar 11, 2013 5:30 am UTC

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?

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

Re: 1184: "Circumference Formula"

Postby alvinhochun » Mon Mar 11, 2013 5:52 am UTC

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?

User avatar
da Doctah
Posts: 812
Joined: Fri Feb 03, 2012 6:27 am UTC

Re: 1184: "Circumference Formula"

Postby da Doctah » Mon Mar 11, 2013 6:02 am UTC

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.
Posts: 1020
Joined: Thu Jun 16, 2011 5:14 pm UTC

Re: 1184: "Circumference Formula"

Postby Kit. » Mon Mar 11, 2013 7:18 am UTC

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

"Or πd" could do, though.

jackal
Posts: 30
Joined: Fri Apr 15, 2011 4:16 am UTC

Re: 1184: "Circumference Formula"

Postby jackal » Mon Mar 11, 2013 7:38 am UTC

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

User avatar
orthogon
Posts: 2724
Joined: Thu May 17, 2012 7:52 am UTC
Location: The Airy 1830 ellipsoid

Re: 1184: "Circumference Formula"

Postby orthogon » Mon Mar 11, 2013 8:24 am UTC

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
Posts: 2
Joined: Fri Apr 18, 2008 8:01 am UTC

Re: 1184: "Circumference Formula"

Postby myxiplx » Mon Mar 11, 2013 8:28 am UTC

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!!!!!

User avatar
Plasma_Wolf
Posts: 93
Joined: Mon Aug 22, 2011 8:11 pm UTC

Re: 1184: "Circumference Formula"

Postby Plasma_Wolf » Mon Mar 11, 2013 8:42 am UTC

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
Posts: 4
Joined: Mon Sep 19, 2011 12:03 pm UTC

Re: 1184: "Circumference Formula"

Postby JoSch » Mon Mar 11, 2013 8:53 am UTC

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.

User avatar
oliphaunt
Posts: 32
Joined: Fri Feb 09, 2007 9:56 am UTC
Location: Delft, Netherlands
Contact:

Re: 1184: "Circumference Formula"

Postby oliphaunt » Mon Mar 11, 2013 8:57 am UTC

"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
Posts: 39
Joined: Wed Nov 24, 2010 2:40 pm UTC

Re: 1184: "Circumference Formula"

Postby TheEngineer » Mon Mar 11, 2013 9:06 am UTC

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

Antior
Posts: 59
Joined: Wed Jan 18, 2012 10:34 pm UTC

Re: 1184: "Circumference Formula"

Postby Antior » Mon Mar 11, 2013 9:46 am UTC

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. :(

User avatar
RAGBRAIvet
Posts: 116
Joined: Tue Apr 05, 2011 12:50 pm UTC
Location: 43° 53' 03" -91° 14' 06"

Re: 1184: "Circumference Formula"

Postby RAGBRAIvet » Mon Mar 11, 2013 9:46 am UTC

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

User avatar
Diadem
Posts: 5652
Joined: Wed Jun 11, 2008 11:03 am UTC
Location: The Netherlands

Re: 1184: "Circumference Formula"

Postby Diadem » Mon Mar 11, 2013 9:56 am UTC

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
Posts: 25
Joined: Wed Dec 09, 2009 1:46 am UTC

Re: 1184: "Circumference Formula"

Postby hordriss » Mon Mar 11, 2013 10:49 am UTC

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) ¸¸.•*¨*•♫♪

User avatar
peewee_RotA
Posts: 502
Joined: Mon Dec 12, 2011 1:19 pm UTC

Re: 1184: "Circumference Formula"

Postby peewee_RotA » Mon Mar 11, 2013 11:05 am UTC

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."

http://timelesstherpg.wordpress.com/about/

User avatar
Klear
Posts: 1965
Joined: Sun Jun 13, 2010 8:43 am UTC
Location: Prague

Re: 1184: "Circumference Formula"

Postby Klear » Mon Mar 11, 2013 11:30 am UTC

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"

Postby ejrb » Mon Mar 11, 2013 11:34 am UTC

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"

Postby sonalita » Mon Mar 11, 2013 11:56 am UTC

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"

Postby nlitchfield » Mon Mar 11, 2013 12:02 pm UTC

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
Posts: 49
Joined: Wed Jul 28, 2010 6:30 am UTC

Re: 1184: "Circumference Formula"

Postby Iranon » Mon Mar 11, 2013 12:25 pm UTC

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
Posts: 6
Joined: Mon Mar 11, 2013 12:24 pm UTC

Re: 1184: "Circumference Formula"

Postby Sandman81 » Mon Mar 11, 2013 12:27 pm UTC

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: 3108
Joined: Wed Nov 16, 2011 6:35 pm UTC

Re: 1184: "Circumference Formula"

Postby rmsgrey » Mon Mar 11, 2013 12:44 pm UTC

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"

Postby gwrankin » Mon Mar 11, 2013 1:24 pm UTC

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

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

Re: 1184: "Circumference Formula"

Postby ctdonath » Mon Mar 11, 2013 1:51 pm UTC

C = τr

You must read the τ Manifesto.

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

Re: 1184: "Circumference Formula"

Postby jrkelly » Mon Mar 11, 2013 2:20 pm UTC

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 :D

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

Re: 1184: "Circumference Formula"

Postby jpvlsmv » Mon Mar 11, 2013 3:34 pm UTC

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

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

Rotherian
Posts: 164
Joined: Mon Nov 07, 2011 1:57 pm UTC

Re: 1184: "Circumference Formula"

Postby Rotherian » Mon Mar 11, 2013 3:39 pm UTC

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.
Image

User avatar
San Fran Sam
Posts: 228
Joined: Tue Nov 15, 2011 5:54 pm UTC

Re: 1184: "Circumference Formula"

Postby San Fran Sam » Mon Mar 11, 2013 3:53 pm UTC

I'm still looking for the first footnote.

Bellomy
Posts: 8
Joined: Fri Nov 30, 2012 5:20 am UTC

Re: 1184: "Circumference Formula"

Postby Bellomy » Mon Mar 11, 2013 4:33 pm UTC

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


Return to “Individual XKCD Comic Threads”

Who is online

Users browsing this forum: No registered users and 68 guests