#### More about Tau:

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Videos

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

#### More about Tau:

## Pi: Who Needs That Many Digits?

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

## Pi and Buffon’s Matches

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

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## Pi Day: It’s an Irrational Holiday

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## Pi Makes a River Bend

### Update

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## Calculating Pi with Real Pies

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## A Bit About Pi

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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.”

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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!

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:

From Numberphile: “How accurately can we calculate Pi using hundreds of REAL pies? This video features Matt Parker, who believes this is the world’s most accurate pie-based Pi calculation.”

Pi Day is coming soon. Maybe you’d like to try a pi project with your family? Check out my Pi Day Roundup of links.

From Numberphile: “Some stuff about Pi, the ‘celebrity number’. This video features maths-loving author Alex Bellos and Professor Roger Bowley from the University of Nottingham.”

Did you notice the error? It was supposed to be “a”…