Intersecting Tangent Secant Theorem
More Lessons for High School Math Regents
High School Math based on the topics required for the Regents Exam conducted by NYSED.
What is the 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
Segments of Secants and Tangents Theorem
The segments of a secant segment and a tangent segment which share an endpoint outside of the circle. The product of the lengths of the secant segment and its external segment equals the square of the length of the tangent segment.
Power of a point with a tangent segment and a secant segment
Tangent - secant demonstration
Demonstration of a circle geometry property
Tangent Secant Theorem (with quadratic expressions) - Geometry
This video focuses on using the Tangent Secant Theorem to find the length of a tangent line segment. This video also reviews how to find the roots of a quadratic equation.
Rotate to landscape screen format on a mobile phone or small tablet to use the Mathway widget, a free math problem solver that answers your questions with step-by-step explanations.
You can use the free Mathway calculator and problem solver below to practice Algebra or other math topics. Try the given examples, or type in your own problem and check your answer with the step-by-step explanations.