"now I know a super utterance to assist maths"
This mnemonic comes from a question in a Mensa puzzle book entitled "Brain Busters", which presented the sentence as a puzzle, stating that the author had used it in school to help with his studies and challenging the reader to reason out how it was used. It's such an odd sentence that it's always stuck with me. As with many Pi mnemonics, it doesn't have too much in the way of practical application, since even cheap scientific calculators today tend to have a key for Pi to this many digits or more. But it's handy for preventing your on-the-fly calculation of the cosine of your golf tee shot from having an error of two or more significant digits. (surely you've all run into this problem before)