Jawabanmu

2014-06-05T14:20:11+07:00
L BCGF = BC . CG
30 = BC . 5
BC = 6
L ACGE = AC . CG
40 = AC . 5
BC = 8
V = La . t = 1/2 . 6 . 8 . 5 = 120 cm³