![]() 03/14/2016 at 10:58 • Filed to: None | ![]() | ![]() |
![]() 03/14/2016 at 13:19 |
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If there’s anything I wish my grade school and high school taught differently, it’s to use diameter rather than radius. It took me a solid minute to figure out why the circumference wasn’t adding up to 2*pi even with the diameter drawings right there! Now in college and industry, I have to unlearn everything from the past 10 years and use diameter. It’s a small thing but it takes a change of thinking.
![]() 03/14/2016 at 13:51 |
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Can you be a little more specific? I am a math teacher. ten years at the high school and now I am a 7th grade math teacher.
![]() 03/14/2016 at 15:26 |
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Are you thinking about radians?
![]() 03/14/2016 at 20:58 |
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It’s not much really. Just that throughout grade school and high school every equation used the radius rather than diameter, so that’s how I thought of these relationships. Now in engineering we use the diameter for even more stuff since its easier to measure. I know its just a simple switch, but for 10 years everything has been C=2*pi*r, A=pi*r^2, Torque=r x F, and in engineering radius is almost never mentioned and I have to make the mental switch each time I think of circular relationships. Just a personal problem of mine I guess.
![]() 03/14/2016 at 21:15 |
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It’s good. I like hearing about this because as a teacher, I know that certain things stuck in my head along the way and I never know what I’ll show my 12-year-olds that might stick in one of their heads. Maybe. Improbably. But you never know.