Jawabanmu

2014-06-06T20:05:31+07:00
V=L.alas x T/3
V=(18 X 18) X 12/3
=1296 CM³

TP²=15²-9²
=225-81
=144
=12
2014-06-06T20:34:10+07:00
V = 1/3×La×t
   = 1/3×(18×18)×15
   = 1620 cm³