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The mean radius of curvature of an object is just the average radius of the local surface curvature, integrated over the entire surface. Normalized by the radius of a sphere with equal volume (the mean radius of curvature of a sphere is just the spherical radius), the mean radius of curvature R for an ellipsoid of revolution becomes [43],
The value of R for the triaxial ellipsoid has also been worked out [49].