A solid consists of a cone and a hemisphere share common base. The cone has a height and a base diameter of 6 cm. (a) (i) the volume, (ii) the total surface area, of the solid. (b) The solid is melted and recast to form solid cylinder with a height of 4 cm. Find the radius the cylinder. (c) If 1000 identical cylinders are to be painted and each tin of paint is needed
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