$\"\"$

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The parallelogram vertices are $\"\"$ , $\"\"$ and $\"\"$ .

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Two adjacent sides of the parallelogram are $\"\"$ and $\"\"$ .

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$\"\"$ .

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$\"\"$

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Consider $\"\"$ and $\"\"$ .

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The area of parallelogram is $\"\"$ .

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Substitute $\"\"$ and $\"\"$ .

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$\"\"$

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$\"\"$

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$\"\"$ .

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The area of the parallelogram is $\"\"$

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$\"\"$

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$\"\"$ .

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The area of the parallelogram is $\"\"$ square units.

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$\"\"$

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The area of the parallelogram is $\"\"$ square units.