Discussion
A logarithmic spiral differs from an Archimedean spiral in that its radius
Answer: A
Correct answer: increases in geometric rather than arithmetic progression
In an Archimedean spiral equal angles add equal increments to the radius; in a logarithmic spiral they multiply it by a constant factor, so the turns spread further apart as the curve grows. The logarithmic form is self-similar under scaling, which is why it appears in shells and in the profiles of certain cams and cutters.
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