The volume of a cone is 16 pi cubic inches. Its height is 12 inches. What is the radius of the cone?

Use the cone volume formula, V = (1/3)πr²h. Substituting V = 16π and h = 12 gives 16π = 4πr², so r² = 4 and the radius is 2 inches. Therefore, the correct choice is D, 2 in.

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