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boxchain · 03-04-2008, 03:59 PM

It's a 15" diameter but you don't know the diameter or radius?

If you have a piece of string, you can run it along the circumference, mark the length, fold that into thirds, and retrace.

You can try this search: http://www.google.com/search?q=geometry+trisect+circle and try 180 or 90 for your angle. Once you get a 30 or 60, you'll be good with the steel ruler.

03-04-2008, 03:59 PM	#3 (permalink)
boxchain I'd rather be biking Join Date: Feb 2008 Location: New Orleans, LA, US Minor Outlying Islands Posts: 127 Lexie - '98 Honda Civic LX 90 day: 39.46 mpg (US) Beater Hauler - '92 Isuzu Pickup Rentaclipse - '08 Mitsubishi Eclipse ? 90 day: 28.28 mpg (US) Fahrt - '83 BMW R80 ST Thanks: 0 Thanked 4 Times in 4 Posts	It's a 15" diameter but you don't know the diameter or radius? If you have a piece of string, you can run it along the circumference, mark the length, fold that into thirds, and retrace. You can try this search: http://www.google.com/search?q=geometry+trisect+circle and try 180 or 90 for your angle. Once you get a 30 or 60, you'll be good with the steel ruler. __________________ My bike runs on dihydrogen monoxide. I like to use these acronyms