To find the density, we need to divide mass by volume, and we already know the mass, so must find the volume. V = 4/3.pi.r^2, and plugging in r=6 gives V = 48.pi, about 150.8 cm^3. The mass is 1710, which we keep in grams as that is what the answer requires. Density = 1710/48.pi = 11.3 gcm^-3.