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r = 20/2 = 10 cm
Volumen esfera = 4/3×π×r³
= 4/3× 3,14 × (10 cm)³
= 4,187 × 1000 cm³
= 4187 cm³ 1cm³ = 1ml
= 4187 ml
d = m/v
m = d×v
= 11,4 g/ml × 4187 ml
= 47731,8 g