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What is the area in square centimeters in trapezoide

What is the area in square centimeters in trapezoide-example-1

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\bf \textit{area of a trapezoid}\\\\ A=\cfrac{h(a+b)}{2}~~ \begin{cases} a,b=\stackrel{bases}{parallel~sides}\\ h=height\\ ---------\\ a=8.6\\ b=12.9\\ h=6.4 \end{cases}\implies A=\cfrac{6.4(8.6+12.9)}{2} \\\\\\ A=\cfrac{6.4(21.5)}{2}
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