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Diket: panjang balok=9cm
lebar balok=4cm
luas permukaan 228cm.
jadi=4×9=36.
228÷36=6,12
228 = 2*(9*4)+(9*t)+(4*t)
228 = 2*(36)+(9*t)+(4*t)
228:2= 36+9*t+4*t
114 = 36+3*t
39*t= 114-36
39*t= 78 : 3
t = 26 cm