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ukuran balok = 15 x 8 x 10
maka :
Lp = 2 x (pxl + pxt + lxt)
= 2 x (15x8 + 15x10 + 8x10)
= 2 x (120 + 150 + 80)
= 2 x 350
= 700 cm²
:2.(15.8+15.10+8.10)
:2.(120+150+80)
:2.350
:700