Geometry: Common Core (15th Edition)

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



Work Step by Step

Applying the Pythagorean Theorem, we find: $$ 64+r^2=\left(r+4\right)^2 \\ 64+r^2=r^2+8r+16 \\ -8r=-48\\ r=6$$
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