Local non-intrinsic property of surface








(a)Normal to the surface(b)Normal section to the surface



(a)Normal to the surface(b)Oblique section to the surface






Normal section of Surface

(a)Normal to the surface(b)Oblique section to the surface



Normal Curvature and related Theorems

Expression of Normal Curvature







Meusnier’s Theorem

(a)Normal to the surface(b)Oblique section to the surface






Principal Sections

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