I. The style of little goldballTwelve millimeters of gold in diameter, weighing 17,4715 grams。Gold with a diameter of 12 mm is defined as a spherical gold with a diameter equal to 12 mm (mm is a symbol of millimetre) and a radius of 6 mm。One centimeter equals 10 mm。6 mm 10 mm/cm = 0. 6 cm。The size of this gold is:V = (4/3) rrr = (4/3) x 3. 14 x 0. 6 x 0. 6 x 0. 6 = 0. 90432 cm3。The density of gold is 19. 32 g/cm