Jawabanmu

2014-04-16T19:48:59+07:00
P x l=340
p x 17= 340
p = 340 : 17 = 20
k= 2p + 2l
  = (2 x 20) + (2 x 17)
  = 40 + 34
  = 74

2014-04-16T20:14:39+07:00
P= 340 / 17 = 20cm ,Keliling= 2(p+l) ➡ 2(20+17) = 68cm sorry kalo salah ngitung, semoga bermanfaat