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V = 4/3
V = 4/3 x 3,14 x 30 x 30 x 30
V = 113 040 cm3
b) luas permukaan bola
L = 4
L = 4 x 3,14 x 30 x 30
L = 11 304
= 4/3 x 22/7 x 30³
= 113142,86 cm³
Lp = 4πr²
= 4 x 22/7 x 30²
= 11314,286 cm²