1. The direction of a vector that is tangent to a curve or surface at a given point; the orientation of the line that touches a curve at exactly one point without crossing it
The tangent vector direction at any point on a circle points perpendicular to the radius at that point.
A direção do vetor tangente em qualquer ponto de um círculo aponta perpendicularmente ao raio naquele ponto.
2. In differential geometry, the direction indicating how a curve is moving or changing at a specific location
To find the tangent vector direction, we compute the derivative of the parametric curve.
Para encontrar a direção do vetor tangente, calculamos a derivada da curva paramétrica.