(adsbygoogle = window.adsbygoogle || []).push({}); 1. The problem statement, all variables and given/known data

I want to show that if the chhord length ||f(s)-f(t)|| depends only on |s-t| then the f is part of a line or circlle. f may not be regular or unit speed.

2. Relevant equations

3. The attempt at a solution

I'm trying to differentiete it and taking ||f'(t)||, but I really need help, because it's not working for me.

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# Homework Help: Plane curves question

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