In geometry [Geometry], a secant is a line that intersects a curve at a minimum of two distinct points. The word secant comes from the Latin word secare, meaning to cut. In the case of a circle, a secant intersects the circle at exactly two points. A chord [Chord (Geometry)] is the line segment determined by the two points, that is, the interval on the secant whose ends are the two points.

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The tangent line at point P is a secant line of the curve.