Meusnier theorem

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If is a curve lying on a surface and is a point on , then the curvature of at , the curvature of the normal section of the surface by the plane passing through the tangent to at , and the angle between the osculating plane of at and the normal plane , satisfy the relation

In particular, the curvature of every inclined section of the surface can be expressed in terms of the curvature of the normal section with the same tangent.

This theorem was proved by J. Meusnier in 1779 (and was published in [1]).


[1] J. Meusnier, Mém. prés. par div. Etrangers. Acad. Sci. Paris , 10 (1785) pp. 477–510



[a1] M.P. Do Carmo, "Differential geometry of curves and surfaces" , Prentice-Hall (1976) pp. 142
[a2] W. Blaschke, K. Leichtweiss, "Elementare Differentialgeometrie" , Springer (1973)
How to Cite This Entry:
Meusnier theorem. Encyclopedia of Mathematics. URL:
This article was adapted from an original article by D.D. Sokolov (originator), which appeared in Encyclopedia of Mathematics - ISBN 1402006098. See original article