Jawabanmu

2014-05-30T16:20:12+07:00
Jaring-jaring balok sama dengan luas permukaan balok
luas permukaan balok = 2 (pl + pt + lt)
484 = 2 [(10x9)+10t+9t]
242 = 90 + 10t + 9t
242-90 = 19t
152 = 19t
t = 152 : 19
t = 8 cm