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jari2 = 1/2 x 30 = 15
Volume bola = 4/3 x 3,14 x 15^3
= 4/3 x 3,14 x 3.375
= 14.130 cm3
v = 4/3 x phi x r³
= 4/3 x 3,14 x 15 x 15 x 15
=4/3 x 10.597,5
= 14.130