Ünlütürk, YasinAbdel-Baky, Rashad2021-11-112021-11-112020-06-30https://doi.org/10.31801/cfsuasmas.527231http://hdl.handle.net/20.500.12575/76008We construct a developable surface tangent to a surface along a curve on the surface. We call this surface as relatively osculating developable surface. We choose the curve as the tangent normal direction curve on which the new surface is formed in the Euclidean 3-space. We obtain some results about the existence and uniqueness, and the singularities of such developable surfaces. We also give two invariants of curves on a surface which characterize these singularities. We present two results for special curves such as asymptotic line and line of curvature which are rulings of the relatively osculating surface.enRelatively osculating developable surfacesCurves on surfacesRuled surfacesArticle6915115272618-6470