HELP! the diagram shows a solid made by joining a solid hemisphere to a solid circular cone. the centre of the plane face of the cone coincides with the centre of the plane face of the hemisphere. the radius of the hemisphere is 3 cm. the radius of the base of the cone is 3 cm. the volume of the solid is 30 pi cm3. work out the total surface area of the solid. give your answer as a multiple of pi.