Principal Radii of Curvature
A curvature's radius, RoC, is simply its reciprocal:
Therefore, there are two principal radii of curvature: A vertical, corresponding to κ1, and a horizontal, corresponding to κ2. Most introductions to the principal radii of curvature provide explanations independent to their curvature counterparts, focusing more on positioning and angle, rather than shape and contortion.
Read more about this topic: Radius Of Curvature (applications)
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