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3
4 π×r³ = 36π
3
r³ = 36 π × 3
π 4
r³ = 9×3
r³ = 27
r = ∛27
r = 3
luas permukaan bola = 4 πr²
= 4×π ×3²
= 4 ×9 π
= 36π
jadi, luas permukaan bola adalah 36π