Answer
$ l = 8.5km$
Work Step by Step
$ l = \sqrt {12^2 - 8.5^2} = \sqrt {144 - 72.25} = \sqrt {71.75} = 8.5km$
Basic College Mathematics (9th Edition)
by Lial, Margaret L.; Salzman, Stanley A.; Hestwood, Diana L.
Published by
Pearson
ISBN 10:
0321825535
ISBN 13:
978-0-32182-553-7
Chapter 8 - Geometry - Review Exercises - Page 617: 68
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