Answer
253 km
Work Step by Step
Applying the Pythagorean Theorem:
$$ 6400^2+d^2=\left(6400+5\right)^2 \\ 40960000+d^2=41024025 \\ d^2=64025 \\ d=253$$
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 - Practice and Problem-Solving Exercises - Page 767: 9
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