# Pi Day

#### grgrsanjay

##### New member
Woo Hoo

Pi Day is observed on March 14 because of the date's representation as 3/14 in month/day date format. This representation adheres to the commonly used approximation of 3.14 for π.

The fractional approximation of π,227, resembles the date July 22 in the day/month format, where it is written 22/7. Pi Approximation Day is therefore celebrated on July 22.

See this http://en.wikipedia.org/wiki/File:Pi_pie2.jpg

Great for celebrating this day

Staff member

#### grgrsanjay

##### New member
Not to forget

Today is Albert Einstein's Birthday

#### SuperSonic4

##### Well-known member
MHB Math Helper
Guess I'll be waiting until July then . Then again the fact it's Wednesday is a good enough reason to eat pi [sic]

#### Sherlock

##### Member
Guess I'll be waiting until July then .
I'll send you a postcard with $\int_{0}^{1}\frac{x^4(1-x)^4}{1+x^2}\;{dx}$ on it.

#### mvCristi

##### New member
Happy "pi day" to everyone.

I hope we will all get to celebrate the entire month of February, '71 together.

#### sbhatnagar

##### Active member
I'll send you a postcard with $\int_{0}^{1}\frac{x^4(1-x)^4}{1+x^2}\;{dx}$ on it.
Surprisingly, $\displaystyle \int_{0}^{1}\frac{x^4(1-x)^4}{1+x^2}\;{dx}=\frac{22}{7}-\pi$.

#### Sherlock

##### Member
Surprisingly, $\displaystyle \int_{0}^{1}\frac{x^4(1-x)^4}{1+x^2}\;{dx}=\frac{22}{7}-\pi$.
Yes, and since the integrand is positive, it proves that in fact $\pi > 22/7.$

That was the point of the joke (for more on the integral, see here).

#### sbhatnagar

##### Active member
Yes, and since the integrand is positive, it proves that in fact $\pi > 22/7.$

That was the point of the joke (for more on the integral, see here).