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12 x s = 420
s = 420/12
s = 35
luas permukaan
Lp = 6 x s²
= 6 x 35²
= 6 x 1225
= 7350cm²
jawabannya adalah 7350 cm ²
420 = 12 x s
420/12 = s
s = 35
luas permukaan kubus = 6 x
= 6 x
= 6 x 1225
= 7.350