The volume of the cone is; (1/3)pi * r²h
56.52 = (1/3) * 3.14 * r² * 6
56.52/(2 * 3.14) = r²
9 = r²
r² = 9
r = √9
r = 3
Diameter = 2*r = 2*3 = 6 inches
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