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r = 30 / 2 = 15 mm
r = 15 / 10 =1.5 cm
v circunferecnia = 4/3 x πp x r³
V = 4/3 x(3.14)(1.5 cm)³
V = 14.13 cm³
d = m / v
d = 10.1 g / 14.03 cm³
d = 0.714 g/cm³