3 ms·
circumference = 2 pi r, so increasing the radius by 1 foot will increase the circumference by 2 pi feet, not pi feet.
by Ono-Sendai 8y ago
circumference = 2 pi r, so increasing the radius by 1 foot will increase the circumference by 2 pi feet, not pi feet.
- Stratoscope 8y agoThank 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.