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Quadrilateral Area Computation

Points $ A, B, C $ and $ D $ have these coordinates: $ A(3,2) $, $ B(3,-2) $, $ C(-3,-2) $ and $ D(-3,0) $. What is the area of quadrilateral $ ABCD $?

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2
3
+
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-
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$\frac{a}{b}$
.
0
=
%

$a^n$
$a^{\circ}$
$a_n$
$\sqrt{}$
$\sqrt[n]{}$
$\pi$
$\ln{}$
$\log$
$\theta$
$\sin{}$
$\cos{}$
$\tan{}$

$($
$)$
$[$
$]$
$\cap$
$\cup$
$,$
$\infty$