Bitangent
Line tangent to a curve at two locations / From Wikipedia, the free encyclopedia
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This article is about the geometric concept. For the basis vector often called the "bitangent" in computer graphics, see Frenet–Serret formulas.
In geometry, a bitangent to a curve C is a line L that touches C in two distinct points P and Q and that has the same direction as C at these points. That is, L is a tangent line at P and at Q.