Count the number of letters in each word:
Pi (π) to 7 decimal places: (Word lengths are digits)
3.141 592 6
Pi (π) to 10 decimal places: (Word lengths are digits)
3.141 592 653 5
Pi (π) to 12 decimal places: (Word lengths are digits)
3.141 592 653 589
Pi (π) to 30 decimal places: (Word lengths are digits)
In rhymes unapt, the great
Immortal Syracusan, rivaled nevermore,
Who in his wondrous lore,
Passed on before,
Left men his guidance
How to circles mensurate.
and another one also to 30 decimal places (written by Michael Shapiro)
By chosen words the young instruct.
Cunningly devised endeavor,
Con it and remember ever.
Widths of circle here you see.
Sketched out in strange obscurity.
3.141 592 653 589 793 238 462 643 383 279 5 (Should we stop here?)
Should you have a repressed desire to experience a brain implosion, try these:
The Near a Raven, an Edgar Allen Poe-esque poem which currently holds the record for longest pi mnemonic, at 740 digits.
Cadaeic Cadenza, a short story (!) which is longer still at 3835 decimal places, and has additional constraints.
You may faint now.