# Happy PI Day 2010

Gold Member
I went to Google this morning and found out that today is http://www.cnn.com/2010/TECH/03/12/pi.day.math/" [Broken].

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zoobyshoe
It's pi day because it's 3-14.

I believe that means it's not pi day in foreign countries because they put the day of the month first.

And, since there's no month 14, there will never be a pi day in foreign countries.

Or is that just circular reasoning?

Staff Emeritus
Gold Member
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Gold Member
Or is that just circular reasoning?

Arrrggghhhh...

You mean $\pi r_0^2$ ?

Exactly. Cakes are square; pie are round.

Staff Emeritus
Gold Member
It's pi day because it's 3-14.

I believe that means it's not pi day in foreign countries because they put the day of the month first.

And, since there's no month 14, there will never be a pi day in foreign countries.

Or is that just circular reasoning?
To be intentionally obtuse, that's not circular, but incomplete. Completeness, within this particular argument, would also require you to note that April never has 31 days.

Of course, Jan 3rd is really not so terrible, but just doesn't have enough zing in it.

Gold Member
It's pi day because it's 3-14.

I believe that means it's not pi day in foreign countries because they put the day of the month first.

And, since there's no month 14, there will never be a pi day in foreign countries.

Or is that just circular reasoning?

Hmm. 3-14-15 will be PI year.

rasmhop
And, since there's no month 14, there will never be a pi day in foreign countries.

Sure there will. We just do it on 22/7 (22nd of July) which is actually closer to pi than 3.14. Alternatively people have been known to do it on the 314th day of the year, but I can never remember when that is and I don't reckon it's that popular except for people who want an extra chance to celebrate pi day.

MotoH
happy Pi-nstein day!

waht
I have a problem with pi. Pi was arbitrarily chosen to be the ratio of circumference over diameter thousands of years ago. But as most problems in math and physics are solved in term of radius than diameter, there is more elegance for pi to be circumference over radius (6.28318). It represents a full 360 degree revolution, and not 180.

Staff Emeritus
Gold Member
Happy pi day! I found the perfect square pie to celebrate.

zoobyshoe
To be intentionally obtuse, that's not circular, but incomplete. Completeness, within this particular argument, would also require you to note that April never has 31 days.

Of course, Jan 3rd is really not so terrible, but just doesn't have enough zing in it.

And it's too close to New Years.

zoobyshoe
Happy pi day! I found the perfect square pie to celebrate.

That's not pie, it's...

MotoH
Just think how hard they partied on 3/14/1592

Pinu7
Shouldn't pi day be tomorrow? It rounds up to 3.15

Staff Emeritus
Gold Member
Shouldn't pi day be tomorrow? It rounds up to 3.15

How? 3.141...rounds down.

Gold Member
Some of the calculations are done by infinite series approximations. There are proofs that some infinite series converge to the value pi. One can then calculate these infinite series to many many terms and get a good approximation of pi (the faster the series converges the better).

Another method would be to make more and more sided polygons and measuring the perimeter vs "radius" of these polygons. If you get a polygon with 1 billion sides, you get a pretty good approximation of pi as well.

Pinu7
How? 3.141...rounds down.

Oh never mind(well, atleast I know pi is 3-ish).