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0 I'm working on a curvature sensor, but I'm finding it hard to find the equation for my h (sagitta) as a function of my arc length. In particular, I want to solve $epsilon=frac{Arc Length - Chord Length}{Chord Length}$ for the sagitta, knowing the Chord Length. So the first step is to get the Arc Length as a function of Chord Length and sagitta, which I think I can do. The second step would be to plug it in the previous equation and solve it for h (as a function of Chord Length and $epsilon$). Is that possible? Thanks geometry circle share | cite | improve this question asked Jun 5 '15 at 19:44 Luis Costa