Tangential Angle: Unit Tangent Vector, Arc Length, Curvature

Tangential and Normal Components: Curve, Tangent, Perpendicular

Riemannian Geometry: Elliptic Geometry, Differential Manifold, Inner Product, Tangent Space, Arc Length

Ogive: Secant Line, Arc, Tangent, Ogives, Arabesque

Spray (Mathematics): Differential Geometry, Vector Field, Tangent Bundle