Answer
$18.0$ m$^{2}$
Work Step by Step
$A=\frac{1}{2}(4)(10)\sin64^{\circ}$
$A=20\sin64^{\circ}$
$A\approx18.0$ m$^{2}$
Elementary Geometry for College Students (5th Edition)
by Alexander, Daniel C.; Koeberlein, Geralyn M.
Published by
Brooks Cole
ISBN 10:
1439047901
ISBN 13:
978-1-43904-790-3
Chapter 11 - Section 11.4 - Applications with Acute Triangles - Exercises - Page 527: 14
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