circumference = 2 pi r, so increasing the radius by 1 foot will increase the cir... | Hacker News

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Ono-Sendai on Feb 20, 2019 | parent | context | favorite | on: Boeing 787 Reaches 801 MPH as a Jet Stream Packs R...

circumference = 2 pi r, so increasing the radius by 1 foot will increase the circumference by 2 pi feet, not pi feet.

Stratoscope on Feb 20, 2019 [–]

Thank you! I had a feeling something must be off in my 50-year-old memory of this puzzle.

I'd better buy an extra 3-4 feet of rope before I try this experiment.

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