Answer
$1.71$
Work Step by Step
By definition: $K=\frac{ab\cdot \sin{(C})}{2}.$
Hence here $a=2,b=5,C=20^o$ , therefore $K=\frac{2\cdot5\cdot \sin{(20^o)}}{2}\approx1.71.$
Precalculus (10th Edition)
by Sullivan, Michael
Published by
Pearson
ISBN 10:
0-32197-907-9
ISBN 13:
978-0-32197-907-0
Chapter 8 - Applications of Trigonometric Functions - 8.4 Area of a Triangle - 8.4 Assess Your Understanding - Page 544: 10
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