Tolong dijawab+cara yg no 3 & 4 고마워

4. v = 1/3 . l alas . t = 1/3 . p.l.t = 1/3.12.12.8 = 384 cm³
lp = l alas x l selimut = 12.12.1/2.14.8 = 144.56 = 8064cm²