$\"\"$

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The equation is $\"\"$ .

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The curve is a part of a circle.

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Formula for the arc length is $\"\"$ .

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$\"\"$ .

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Differentiate the function with respect to $\"\"$ .

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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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Evaluate the integral $\"\"$ by using substituting method.

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Let $\"\"$ .

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$\"\"$

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$\"\"$

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$\"\"$

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$\"\"$

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$\"\"$

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Substitute $\"\"$ .

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$\"\"$

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$\"\"$

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$\"\"$

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$\"\"$

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$\"\"$ units.

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$\"\"$

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$\"\"$ units.