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90 cm = 9 dm
volume = 648
p x l x t = 648
6 x 9 x p = 648
54 p = 648
p = 648/54
= 12dm
luas permukaan
Lp = 2 ( pxl + pxt +l xt)
= 2 ( 12x6 + 12x9 + 6x9)
= 2 ( 72 + 108 + 54)
= 2 ( 234)
= 468 dm²