I see that we are lacking a definition of radius of curvature : I want to use the most obvious definition(to me) : Distance of point from centre of ... ... <看更多>

The radius of curvature R(t) is equal to 1/κ(t), where κ(t) is the curvature of the curve at point t, which for a parametric planar curve is ... ... <看更多>

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