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Luas permukaan = 6 x s²
384 = 6 x s²
s² = 384/6
s²=64
s=√64 = 8cm.
384 cm² = 6 × r²
384 : 6 = r²
64 = r²
8 cm = r
Pangjang rusuk-rusuk kubus = 12 × 8 = 96 cm
Maaf kalau ada kesalahan