## Elementary Geometry for College Students (6th Edition)

Published by Brooks Cole

# Chapter 10 - Section 10.4 - Analytic Proofs - Exercises - Page 465: 28

#### Answer

$m = -\frac{h-c}{k-d}$

#### Work Step by Step

The tangent line is perpendicular to the radius. Thus, we first find the slope between the point and the radius: $m= \frac{k-d}{h-c}$ The slope of the tangent line is the opposite reciprocal, so we find: $m = -\frac{h-c}{k-d}$

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