Given :

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Area of a sector $\"\"$ .

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Area of a sector $\"\"$

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$\"\"$

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$\"\"$

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$\"\"$ .

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Length of an arc $\"\"$ .

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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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Therefore, arc length of the sector JK is $\"\"$ units.

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