Jawabanmu

2014-04-20T21:47:44+07:00
L. alas=1/2xd1xd2=1/2x12x15=90 cm2
volume prisma= L. alasxtinggi= 90x22=1980cm3

2014-04-20T21:55:42+07:00
V = L.alas . t
   = (d1.d2/2) . t
   = (15.12/2) . 22
   = (15 . 6) .22
   = 90 . 22
   = 1980 cm3