Jawabanmu

2014-06-08T15:20:45+07:00
V = 1/3 * Luas alas * T | 864 = 1/3 * 144 * T | 864 = 48T | T = 18 cm.
2014-06-08T15:23:05+07:00
V= La × T
864= 12 × T
12 × T = 864
T= 864 : 12
T= 72 cm