The formula for the volume of cone is \"\", where r = radius and h = height.

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The volume of cone is \"\".

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\"\"

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Multiply each side by \"\".

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\"\"

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\"\"

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\"\"

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\"\"

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From the above equation r = 3 and h = 6 respectively.

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Diameter d = 2r = 2(3) = 6 inches and height h = 6 inches.

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Options B is correct answer.