How do the lengths of tangent and secant line compare from a point outside of a circle

The video tutorial explains the concepts of secant and tangent lines in geometry. A tangent line touches a circle at one point and is perpendicular to a radius or diameter, while a secant line intersects the circle at two points. Both lines originate from a point outside the circle, and their lengths have a specific relationship: the square of the tangent segment equals the product of the secant segment and its external part. The tutorial concludes with an invitation to solve an example problem.

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