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#
Pi Day

## For the Curmudgeons: Vi Hart’s Anti-Pi Rant

#### More about Tau:

## Happy Birthday, General Relativity

#### You may also enjoy:

## Pi: Who Needs That Many Digits?

#### How you round it off makes a difference:

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## Pi and Buffon’s Matches

#### For a kid-friendly version of this experiment, try throwing food:

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## Unending Digits… Why Not Keep It Simple?

#### Math Poetry Activity

## Pi Day: It’s an Irrational Holiday

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## Pi Makes a River Bend

### Update

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Denise Gaskins' Let's Play Math

Helping families to learn and enjoy math together.

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Don’t forget that Pi Day is also Albert Einstein’s birthday! And this year marks the 100th anniversary of his Theory of General Relativity. So Science Magazine has a special Einstein issue online, featuring this interactive comic:

- the Happy Birthday, Einstein! video series
- Happy Birthday, Einstein (Part 2)
- Happy Birthday, Einstein (Part 3)
- Happy Birthday, Einstein (Part 4)
- Albert Einstein’s math biography
- Math-related quotes from Albert Einstein

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From Numberphile: Pi is famously calculated to trillions of digits – but Dr. James Grime says 39 is enough.

An extra note from Dr. Grime: “Since pi39 ends in 0, you may think we could use pi38 instead, which has even fewer digits. Unfortunately, the rounding errors of pi38 are ten times larger than the rounding errors of pi39 — more than a hydrogen atom. So that extra decimal place makes a difference, even if it’s 0.”

From Numberphile: Dr Tony Padilla’s unique (and low budget) twist on the Buffon’s Needle experiment to learn the true value of Pi.

Do you have a favorite family activity for celebrating Pi Day? I’d love to hear it!

Unending digits …

Why not keep it simple, like

Twenty-two sevenths?—Luke Anderson

Encourage your students to make their own Pi Day haiku with these tips from *Mr. L’s Math*:

And remember, Pi Day is also Albert Einstein’s birthday! Check out this series of short videos about his life and work: Happy Birthday, Einstein.

Wednesday Wisdom features a quote to inspire my fellow homeschoolers and math education peeps. Today’s quote is from Luke Anderson, via TeachPi.org. Background photo courtesy of Robert Couse-Baker (CC BY 2.0) via Flickr.

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I just discovered this fun Pi Day song from The Singing Nerd. Definitely need to add him to my YouTube subscriptions.

Hat tip: Singing Banana.

From Numberphile: “Sinuosity is a measure of how ‘bendy’ a river is. It is the length of the river divided by the direct route. Featuring Dr. James Grime.”

After posting this video, Dr. Grimes and Lawrence Roberts began collecting and analyzing data about real-world rivers. It turns out the pi theory of sinuosity is too simple. Read about their results: