I learned this little diddy when I was 16 from Harry J. Smith's wonderful book "Fun With Mathematics" and have never forgotten it.

Count the letters in each word to give you the mathematical value of Pi to 12 places.

See, I have a rhyme assisting
my feeble brain its tasks oftimes resisting.

Or, if you have a memory for numbers:
3.141592653589

Now, you'll never wonder about the value again, eh?

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