Jawabanmu

2014-06-06T10:58:30+07:00
T = V / ( pxl)
   = 1800 / ( 15 x 6 )
  = 1800 / 90
  = 20

LPB = 2 (PL+PT+LT)
       = 2 ( 15x6 + 15 x 20 + 6 x 20 )
      = 1020
2 1 2
2014-06-06T11:03:53+07:00
Tinggi balok=1800:15:6=20
luas permukaan balok=2xpxl+lxt+pxt
=2x15x6+6x8+15x20
=2x90+48+300
=528cm kubik
maaf klo salah
1 1 1