Tangents of Circles (Congruence Geometry)
Channel: Andrew Misseldine
Date: 2022-02-15

In this video, we state and prove that a line is tangent to a circle if and only if it is perpendicular to its associated radius in a congruence geometry.

This is part 21 (3/3) of the lecture series offered by Dr. Andrew Misseldine for the course Math 3130 - Modern Geometries at Southern Utah University. A transcript of this lecture can be found at Dr. Misseldine's website or through his Google Drive at: 
https://drive.google.com/file/d/1s59NGVg-NevmjS-wx9jVbr5_6Z-XVQDg/view

This lecture is loosely based upon Section 4.5 of Roads to Geometry by Wallace and West. Please post any questions you might have below in the comment field and Dr. Misseldine (or other commenters) can answer them for you. Please also subscribe for further updates.