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Luas bola = 4πr²
Luas 1/2 bola = 4/2 πr²=2πr²
Luas belahan = πr²
Luas permukaan = luas 1/2 bola + luas belahan
= 2πr²+πr²
= 3 πr²
= 3.3,14.10²
= 942 cm²