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t = 0,6 x 10
= 6
luas permukaan kardus
Lp = 2 ( pxl + pxt + lxt)
= 2 ( 14x 12,5 + 14x 6 + 12,5x6)
= 2 ( 175 + 84 + 75)
= 2 ( 334 )
= 668 cm²