I have a question about distance. how big does a circle have to be for it to lokk like you're walking in a straight line? I can't find the answer anywhere and I don't know how to calculate the answer. Thank-you. T

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- July 14th 2008, 03:08 PM #1

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- July 14th 2008, 03:42 PM #2
That is a purely subjective question.

The curvature is the measure of how quickly the tangent to the curve is changing direction. Because lines have curvature of zero, you are asking: how large does the radius need to be in order for the curvature is almost zero? How close to zero do you think do you need?

- July 14th 2008, 03:52 PM #3

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- July 14th 2008, 04:10 PM #4

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## tami1215

I'm sorry, I think my question is poorly phrased and causing some confusion. For me at least. I want to find the circumfence? of a sphere that is large enough that if I were to walk around it the curvature would not be noticable. But I also need to find the smallest sphere where that would be possible. Thank-you T