Tangent planes and normal lines of surfaces

[72/63%]

Subtopics

Computing the tangent plane and normal at a point[45/67%]
Orthogonal families and triply orthogonal systems of surfaces[12/25%]
Tangent-plane invariants of special surfaces[7/57%]
Angle between two intersecting surfaces[4/100%]
Normal to a surface of revolution meets its axis[2/100%]
Variation of the normal direction across a surface[2/100%]