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Intersecting Tangent Secant Theorem

High School Math based on the topics required for the Regents Exam conducted by NYSED.

 

 

Secant-Tangent Rule

If a secant segment and tangent segment are drawn to a circle from the same external point, the product of the length of the secant segment and its external part equals the square of the length of the tangent segment.

For example, in the following diagram PC2 = PB × PA

tangent secant

 

 

Power of a point with a tangent segment and a secant segment

 

 

Tangent - secant demonstration
Demonstration of a circle geometry property

 

 

Secant Tangent Rule

 

 

 

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