Jawabanmu

2014-03-03T11:41:23+07:00
Luas alas = p x l = 18 x 10 = 180  cm
luas segitiga = 4x 1/2 a x t = 4 x 1/2 x 10 x 12= 240

luas total limas = 180+240= 420 cm
2014-03-03T11:52:40+07:00
Luas alas=18x10=180
luas limas=1/3x180x12
               =2160/3=720