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36π = 4/3 πr³
36 = 4/3 r³
27 = r³
r = 3 cm
luas permukaan = 4πr²
= 4 x 3.14 x 3 x 3
= 113.04 cm²
4/3r³=36
r³=27 ⇒∛27=3
luas kulit=4πr²=?
jb:4 . 3,14 . 3²⇒113 cm²