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4.phi.r² = 803,84
4.3,14.r² = 803,84
12,56.r² = 803,84
r² = 803,84 : 12,56
r² = 64
r = √64
r = 8 cm
jadi,
V bola
= 4/3.phi.r^3
= 4/3.3,14.8^3
= 4/3.3,14.512
= 2143,57 cm kubik
^ = pangkat