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panjang = 24 cm
lebar = 15 cm
tebal = 8 cm
maka :
Luas sisi = 2 x (pxl + pxt + lxt)
= 2 x (24x15 + 24x8 + 15x8)
= 2 x (360 + 192 + 120)
= 2 x 672
= 1.344 cm²