# Pi Day Math for Cooks

First of all – Happy Pi Day!
If you are a math nerd, this is a fun day!
March 14 or 3.14…and I did not just admit to being a nerd?!?

What is pi?
It is the ratio of the circle’s circumference to its diameter.

So here, my lovely Le Creuset Enameled Cast-Iron Tarte Tatin pan has a diameter of 9 1/2 inches. What is the circumference you ask?
That is where my handy little mysterious irrational number comes in! The circumference is the diameter (as measured by my whimsical tape measure) multiplied by pi.
The circumference of my Le Creuset pan:
pi d = C
3.141592653589793238462643383279502884+ X 9.5 = 29.845130209+
OK, I am off to bake a 30″ circumference apple tarte tatin!
Did you enjoy some pie on Pi Day?

(Portions of this post were written for Pi Day 2008, as some things never change, and pi is one of them).

## 12 thoughts on “Pi Day Math for Cooks”

1. White on Rice Couple says:

That measuring tape is a crack up! Happy pi+1 day. Does that make today April 14th? Todd

2. Julia says:

I love the tape measure too! Reminds me of March “in like a lion, out like a lamb.” How fitting on Pi day!

Honestly, though, I think more recipes should specify baking dishes by their circumference. It makes much more sense, don’t you think?

3. Elena says:

Oh my god!
What an adorable measuring tape! Where can I get one?

4. Simona says:

I made a jam tart. Not a pie, but related.

5. daveagp says:

I made a sweet potato pie based on Alton Brown’s recipe in Good Eats. I had never made or eaten one before. It’s frigging awesome, it’s like pumpkin pie but without feeling like you eat a jack’o’lantern.

6. foodbin says:

cute tape!

7. Nina Timm says:

You have quite a sense of humor for a “nerd”! Thx for the recipe and the smile on my face!!!

8. Creative Vignettes says:

I completely jumped over Pi Day, right into the Ides of March. Now I have to remember to wear green on Tuesday. I wouldn’t want to get pinched!

9. Chiara Cogli says:

Hi Lori,

Excellent post, love the measuring tape! My Pi day pie was a rainbow chard and pancetta quiche confection, and I made it in my beloved Emile Henry pie dish!
Your cast iron Le Creuset tatin pan looks awesome, and at least these ones are made in France (the ceramic le creuset are all made in Thailand, more exotic than authentic đ

Chiara

10. ~~louise~~ says:

Adorable! I once collected measuring tapes. You would be surprised how many people do:)

I agree, baking dishes should be by measurement especially now that we all know what Pi is:)

11. Lori Lynn says:

Hi EVERYONE!

Isn’t Pi Day a hoot! Can’t wait ’til next year. How’s your memorization of pi going? At least you have it down to
3.1415926, picture it as eating pie for dessert after lunch 34 seconds before 2 o’clock on March 14. Easy. 3.14 at 1:59:26. Now you can impress your kids!
Lori Lynn

The tape measure is cute, but was a gift, so I don’t know where to tell you to get one đ

12. Jude says:

The sad part is, I can sort of follow the numbers on your post. Why hello fellow geek đ

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