Jawabanmu

2014-05-18T21:14:21+07:00
70 = 2 × 4x + 2 × x
70 = 8x + 2x
70 = 10x
x = 7

p = 4 × 7 = 28
l = 7

L = p×l
L = 28 × 7 =196 cm²


 Maaf kalau ada kesalahan
2014-05-18T21:17:12+07:00
K = 2(p+l)
70 = 2(4+1)
70 = 2.5
70 = 10
70/10 = 7

p = 4.7 = 28
l = 1.7 = 7

L=p.l
 = 28.7
 = 196

maaf kalau salah:)