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L. persegi panjang = p*l
112 cm = 14 * l
l = 112/14 = 8
Luas permukaan balok = 2(p*l + p*t + l*t)
= 2(12*8 + 14*5 + 8*5)
= 2(96+70+40)
= 412 cm(kuadrat)