$\"\"$

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The function is $\"\"$ and the interval $\"\"$ .

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Using mid point theorem:

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The area is $\"\"$ .

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Consider $\"\"$ .

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Where $\"\"$ , $\"\"$ and $\"\"$ .

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Substitute $\"\"$ in $\"\"$ .

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$\"\"$

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$\"\"$ .

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Substitute $\"\"$ in $\"\"$ .

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$\"\"$ .

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$\"\"$ .

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$\"\"$ .

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$\"\"$

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Substitute $\"image\"$ values from 1 to 4 $\"\"$ .

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$\"\"$

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$\"\"$

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$\"\"$

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$\"\"$

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$\"\"$

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$\"\"$

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Using mid point theorem:

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Area = $\"\"$ $\"\"$

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$\"\"$ .

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$\"\"$

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Area of the region is $\"\"$ sq-units.