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4 x 22/7 x r2 = 2464
r2 = 196
r = 14
LBB = 3 x phi x r xr
= 3 x 22/7 x 14 x 14
= 66 x 28
= 1848
Lb bola padat = 3πr² = 2464/4 x 3 = 1848 cm²