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133, 04 = 4/3 x 3,14 x r³
4/3r³ = 133,04/3,14
4/3r³ = 36
r³ = 36/ 4/3
r³ = 27
r = 3
L = 4 π r²
= 4 x 3,14 x 3²
= 113, 04 (b)