Jawabanmu

2014-05-27T15:10:29+07:00
Volume prisma = luas alas x tinggi
1920 = (3x.4x)/2 . 20
1920 = 120x²
x² = 16
x = 4cm

d2 = 4x = 4 . 4 = 16 cm
1 5 1