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12 cm x 12 cm x15 cm=2140 cm pangkat 3
ukurn kotk = 12 x 12 x 15 cm
maka :
Lp = 12x12 + (2x (12x15 + 12 x 15))
= 144 + (2 x (180+180))
= 144 + (2 x 360)
= 144 + 720
= 864 cm²