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d = s = 30 cm
r = 30:2 = 15 cm
volume bola terbesar = × ×
= × 3,14 ×
= 4500 × 3,14
= 14130
r = 1/2rusuk
r = 15 cm
Volume bola
V = ⁴⁄₃ π r³
...= ⁴⁄₃ π (15)³
...= 4500 π cm³
...= 14130 cm³