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volume = 4/3 phi r^3 = 1500
4/3 . 3,14 r^3 = 1500
4,19 r^3 = 1500
r^3 = 1500/4,19
r^3 = 500
r =akar(3) 500
r = 7,9 mendekati 8 cm
1500 = 4/3 . 22/7 r^3
1500 = 88/21 r^3
r^3 = 1500 : 88/21
r^3 = 1500 x (21/88)
r^3 = 375 x (21/22)
r^3 = 7875/22
r = akar pangkat 3 dari 7875/22