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"What is the number of surfaces of a right circular cylinder.\nA cube and a sphere are of the same height. Find the ratio of their volume.\nFind the total surface area of a cone whose radius is \\( r / 2 \\) and slant height is \\( 2 x \\).\nFind the ratio of the lateral surface area and total surface area of a cube.\nIf the radius of sphere is doubled. What will happen to its surface area?"

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