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Verified answer
Bangun Ruang Sisi LengkungBola
r = ½ × sisi kubus
r = ½ × 20 cm
r = 10 cm
Luas Permukaan
= 4πr²
= 4 × 3,14 × 10 cm × 10 cm
= 4 × 314 cm²
= 1.256 cm²