Jawabanmu

2014-04-09T15:07:14+07:00
Volume = 1/3 x luas alas x tinggi
312 = 1/3 x L x 13
312 = 1/3 x 13 x L
312 = 13/3
312 = 4,3
     = 72,55


(semoga benar, maaf jika masih salah..)
2014-04-09T15:23:59+07:00
V = 1/3 x luas alas x tinggi 312 = 1/3 x luas alas x 13 luas alas = (312x3)/13 luas alas = 72 cm ^2