$\"\"$

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The height of the trapezoid is 4.3 mm, bases are 2.1 mm and $\"\"$ and area is 16.555 $\"\"$ .

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Area of a trapezoid is $\"\"$

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$\"\"$ (Substitute 4.3 for $\"\"$ , 2.1 for $\"\"$ and 16.555 for A)

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$\"\"$ (Divide: $\"\"$ )

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$\"\"$ (Divide each side by 2.15)

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$\"\"$ (Cancel common terms)

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$\"\"$ (Divide: $\"\"$ ) $\"\"$

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$\"\"$ (Subtract 2.1 from each side)

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$\"\"$ (Apply additive inverse property: $\"\"$ )

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$\"\"$ (Apply additive identity property: $\"\"$ )

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$\"\"$ (Subtract: $\"\"$ ) $\"\"$

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The base $\"\"$ of the trapezoid is 5.6 mm.