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36 π = 4/3 π .r³
36 = 4/3 r³ (phi/π telah di saling bagi atau disederhanakan)
4/3 r³ = 36
r³ = 3/4 .36
r³ = 27
r = ∛27
r = 3 cm
luas kulit bola = 4πr²
4.3,14.(3)² = 113.04
jadi luas kulit bola tersebut ⇒ 113,04 cm²
113,04 cm²