Answer
6
Work Step by Step
Applying the Pythagorean Theorem, we find:
$$ 64+r^2=\left(r+4\right)^2 \\ 64+r^2=r^2+8r+16 \\ -8r=-48\\ r=6$$
Geometry: Common Core (15th Edition)
by Charles, Randall I.
Published by
Prentice Hall
ISBN 10:
0133281159
ISBN 13:
978-0-13328-115-6
Chapter 12 - Circles - 12-1 Tangent Lines - Lesson Check - Page 766: 2
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