Jawabanmu

2014-06-03T21:05:48+07:00
V = L alas× t
960  =   \frac{1}{2} . 2x . 3x . 20
960 = 60x²
x²=  \frac{960}{60}
x²= 16
x=  \sqrt{16}
x= 4

maka, d2= 3(4) = 12 cm