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36 phi = 4/3 x phi x r^3
36 = 4/3 x r^3
36 x 3/4 = r^3
27 = r^3
akar^3 27 = r
3 = r
L = 4 x phi x r x r
L = 4 x 3,14 x 3 x 3
L = 113,04 m^3 atau 36 phi m^3