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=16x17
=272cm2
12/16 = 12/(17+x)
17+x = 20
x = bagian bawah = 3 cm
ukuran karton
panjang = 2 + 15 + 3 = 20 cm
lebar = 2 + 12 + 2 = 16 cm
luas karton = p × l = 20 × 16 = 320 cm²