Jawabanmu

2014-06-08T09:50:31+07:00
A. V = plt
24 = 4 x 3 x t
t = 24/12 
t = 2cm
Luas Perm. = 2 (pt + pl + lt)
L.P = 2 (8 + 12 + 6)
Lp = 2 x 26
Lp = 52cm²

B. V = plt
315 = 9 x 7 x t 
t = 315/63
t = 5cm
Luas Perm = 2 (pt + pl + lt)
Lp = 2 (45 + 63 + 35)
Lp = 2 x 143
Lp = 286cm²
2014-06-08T09:51:09+07:00
A) v = plt
   24 = 4 x 3 x t
   24 = 12 x t
   t   = 24 : 12 = 2 cm
  Lp = 2( pl + pt + lt)
  Lp = 2( 4 x 3 + 4 x 2 + 3 x 2)
  Lp = 2(12 + 8 + 6)
  Lp = 2 x 26
  Lp = 52 cm²

b) v = plt
    315 = 9 x 7 x t
    315 = 63 x t
      t   = 315 : 63 = 5 cm
    Lp = 2(pl + pt + lt)
    Lp = 2(9 x 7 + 9 x 5 + 7 x 5)
    Lp = 2(63 + 45 + 35)
    Lp = 2 x 143 = 286 cm²