The ratio of the base radii of a cylinder to a cone is 4:4, and the ratio of heights is 4:5. The volume of the cone is d9 of the volume of the cylinder?
一个圆柱和一个圆锥的底面半径的比是得：4，高的比是4：5．圆锥的体积是圆柱的体积的d9？
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