$\"\"$

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Circumference of the donut is $\"\"$ .

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Find the donuts diameter.

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The formula for circumference is $\"\"$

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$\"\"$ (Original equation)

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$\"\"$ (Substitute $\"\"$ in the equation)

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$\"\"$ (Divide each side by $\"\"$ )

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$\"\"$ (Simplify)

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$\"\"$ .

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Therefore, the diameter of the donut is $\"\"$ .

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$\"\"$

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The diameter of the donut is $\"\"$ .