$\"\"$

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(a)

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Radius of a circular disk is $\"\"$ cm.

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Let $\"\"$ be the radius of the circular disk.

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Error in measuring radius of a circular disk is $\"\"$ cm.

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Area of the circle is $\"\"$ .

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Apply derivative on each side.

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$\"\"$

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$\"\"$ .

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Substitute $\"\"$ and $\"\"$ in above expression.

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$\"\"$

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Maximum possible error in the area of the disk is $\"\"$ .

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$\"\"$

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(b)

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Relative error in the area of the disk is $\"\"$ .

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$\"\"$

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Relative error in the area of the disk is $\"\"$ .

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Percentage error in the area of the disk is $\"\"$ .

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$\"\"$

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Percentage error in the area of the disk is $\"\"$ .

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$\"\"$

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(a)

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Maximum possible error in the area of the disk is $\"\"$ .

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(b)

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Relative error in the area of the disk is $\"\"$ .

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Percentage error in the area of the disk is $\"\"$ .