Jawabanmu

2014-05-29T08:58:14+07:00
Diagonal ruang = √(12×12) + ( 9×9 ) + ( t×t)
17 = √ 144 + 81 + (t×t)
17 = √ 225 + (t×t)
17 = 15 - t
t = 17 - 15
t = 2 cm

volume = p × l × t
v = 12 × 9 × 2
v = 216