I believe that mathematics should be taught, not collaboratively explored; algebra and geometry are better than a vague course of Integrated Math; spiraling doesn't work nearly as well as learning it properly the first time; "I don't DO math" should be an incentive rather than an excuse. "I don't DO English" should be treated the same way.
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Sunday, December 23, 2012
Pulley Puzzle
A puzzle by Harry Langman:
A thin belt is stretched around three pulleys, each of which is 2
feet in diameter. The distances between the centers of the pulleys are 6
feet, 9 feet, and 13 feet. How long is the belt?
28 + 2pi ?
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