Jawabanmu

2014-05-09T19:31:04+07:00
Lp = (2 x p x l) + (2 x p x t) + (2 x l x t)
500 = (2 x 15 x 4) + (2 x 15 x t) + (2 x 4 x t)
500 = 120 +30t + 8t
500 - 120 = 38t
380 = 38t
380/38 = t
10 cm = t
1 5 1
2014-05-09T19:31:47+07:00
Luas permukaan = 2 (pl + pt + lt)
500 = 2 (15.4 + 15 . t + 4 . t)
500 = 2 (60 +19t)
500 = 120 + 38t
500 - 120 = 38t
380 = 38t
t = 380 / 38
= 10