If a cone is 8.4 cm high and base radius is 2.1 cm is melted and cast into a sphere. find the radius of the sphere
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vol. of cone = vol. of sphere
1/3*pi*r^2*h = 4/3*pi*R^3
R = 21/5root2
1/3*pi*r^2*h = 4/3*pi*R^3
R = 21/5root2
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