I guess he's never heard of Archimedean spirals. Replace that rod in the center with a 55 gallon drum or similar and it would cut the whole patch instead of cutting and recutting the same path.
But if you want a rational fraction approximation, the best one is 355/113 = 3.14159292035, an error of 0.000008491 % !
The mnemonic I used to teach my duller students was to write down the first three odd numbers twice in a string (113355) and split it down the middle to form two three digit numbers (113 355). If you can't figure out how to divide these two numbers to get a number close to three, you have no business fooling around with advanced mathematical concepts like pi.
Last edited by mklotz; 10-12-2019 at 08:45 AM.
I tried that lawnmower on a rope trick when I was a kid but I couldn't get my younger sister to push the reel type push mower for more than 1 revolution so gave it up as a bad idea
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