Answer
$$.62$$
Work Step by Step
We find using trigonometry that:
$$ .5BC = cos(72) \\ BC =.62$$
Elementary Geometry for College Students (7th Edition)
by Alexander, Daniel C.; Koeberlein, Geralyn M.
Published by
Cengage
ISBN 10:
978-1-337-61408-5
ISBN 13:
978-1-33761-408-5
Chapter 5 - Section 5.6 - Segments Divided Proportionally - Exercises - Page 269: 39
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