Jawabanmu

2014-06-04T20:00:28+07:00
2(pxl) = 2(10x8) = 2(80)=160
2(pxt) = 2(10t) = 20t
2(lxt) = 2(8t)=16t

20t+16t=36t

36t = 376-160
36 t = 216
  t  =  \frac{216}{36}
  t  = 6 cm

V = p x l x t
   = 10 x 8 x6
   = 480  cm^{2}
1 5 1
2014-06-04T20:00:38+07:00
L per balok = 2((p . l) + (p . t) + (l . t))
376 = 2((10 . 8) + (10 . t) + (8 . t))
376 = 2(80 + 10t + 8t)
376 = 2(80 + 18t)
376 = 160 + 36t
376 - 160 = 36t
216 = 36t
t = 6

v = p . l . t
v = 10 . 8 . 6
v = 480 cm³