Trigonometry 7th Edition

Published by Cengage Learning
ISBN 10: 1111826854
ISBN 13: 978-1-11182-685-7

Chapter 1 - Section 1.1 - Angles, Degrees, and Special Triangles - 1.1 Problem Set - Page 12: 45



Work Step by Step

$a^{2}+c^{2}=d^{2}$ $r^{2}+8^{2}=(4+r)^{2}$ $r^{2}+64=(4+r)^{2}$ $r^{2}+64=16+8r+r^{2}$ $r^{2}+48=8r+r^{2}$ $48=8r$ $r=6$
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