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1.256 = 12,57 x r^2
r = akar (1.256 / 12,57)
r = 9,996
Jadi volume bola = 4/3 x 22/7 x r^3
= 88/21 x 9,996^3
= 4.185,45 cm3
jadi yang mendekati adalah = B. 4186,7 cm kubik