Answer
$18\ cm^2$
Work Step by Step
The area $A$ of a triangle of base $b$ and height $h$ is $\frac{bh}{2}$; that is
$$
A=\frac{4\times 9 }{2}=18\ cm^2
.$$
Precalculus: Concepts Through Functions, A Unit Circle Approach to Trigonometry (3rd Edition)
by Sullivan III, Michael
Published by
Pearson
ISBN 10:
0-32193-104-1
ISBN 13:
978-0-32193-104-7
Appendix A - Review - A.2 Geometry Essentials - A.2 Assess Your Understanding - Page A19: 28
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