# All things pi: How to celebrate one of the nerdiest holidays of the year (10 items)

The number pi, which begins 3.14, is irrational and therefore without an end. The University of Utah posted pi to 10,000 digits, and other websites have expanded the number even further.

Physicist Larry Shaw at the Exploratorium in San Francisco established Pi Day in 1988 and in 2009 the United States House of Representatives passed a resolution that officially recognized the day. National Pi Day has gained popularity over the years with more celebrations and events planned.

If you can't get enough of pi — or the pie that usually comes with it — get your nerd on with some of these celebration suggestions.

Related: Looking for the perfect Pi Day pie? Here are 25 recipes to help you out

## 1 of 10. The City Library Pi Day celebration

## 2 of 10. Celebrate with Zaniac

## 3 of 10. Grab a slice from the Pi

## 4 of 10. Get some exercise

For hikers, the Donut Falls trail in Big Cottonwood Canyon is roughly 3.14 miles long.

## 5 of 10. 'Pi' up your waredrobe

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Comments (9)

"in 2009 the United States House of Representatives passed a resolution that
officially recognized the day."

I can think of roughly 3.14
reasons why this does well to illustrate how poorly our tax dollars are being
used.

Pi is an irrational number, which means you literally can't write out all the digits. But if you're going to approximate pi, the accepted method is to pick a degree of precision (say, three decimal points) and write the digits up to that point, rounding the last one if necessary. Thus, pi to three decimal points is 3.142; pi to five decimal points is 3.14159; and so on. Contrary to the illustration that accompanies item #7 in this list, 3.145 is not a particularly good approximation of pi.

Let's start by acknowledging the importance of science, and knowledge in general.

Haha! Good catch. 3.145.

Question: How is pi considered a
mathematical constant even though there is no final decimal number? For instance
how c is a universal physical constant, but c ends in .0000etc, and pi never
ends on the right of the decimal.

@SillyRabbit

In math, a constant does not have to be a rational
number. A mathematical constant can be any number of special physical
significance. In the case of pi, take the circumference of a circle and divide
it by the diameter of that same circle and you get pi. What's cool is you
get the same answer when you do the same thing to ANY circle of ANY size.
That's why pi is a constant - because the value is the same no matter what
circle you're trying this on.

Other irrational constants are
Euler's number (e), Pythagoras' number (square root of 2), and the
gravitational constant (G).