Answer
$4232$ $cm^2$
Work Step by Step
Let $h(x)$ denote the height of the wing at $x$ $ cm$ from the left end.
$A$ $\approx M_5=\frac{200-0}{5}[h(20)+h(60)+h(100)+h(140) +h(180)]$
$=40(20.3+29.0+27.3+20.5+8.7)$
$=40(105.8)$
$=4232$ $cm^2$
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