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What does A Equal in this Problem?

What does A Equal in this Problem?-example-1

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\text{Area of the trapezoid}= \left(\frac{AD+BC}2\right)CK\\\\\\~~~~~~~~~~~~~~~~~~~~~~~~~~~~~=\left( \frac{10+8}2\right) * 30 \\\\\\~~~~~~~~~~~~~~~~~~~~~~~~~~~~~=\frac{18}2 * 30\\\\\\~~~~~~~~~~~~~~~~~~~~~~~~~~~~~=9 * 30\\\\\\~~~~~~~~~~~~~~~~~~~~~~~~~~~~~=270~~ \text{sq units.}

User Adrian Adendrata
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