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panjang = 20 cm
lebar = 10 cm
tinggi = 15 cm
maka :
Lp = 2 x (pxl + pxt + lxt)
= 2 x (20x10 + 20x15 + 10x15)
= 2 x (200 + 300 + 150)
= 2 x 650
= 1.300 cm²