Jawabanmu

2014-04-15T09:03:55+07:00
KLL: 2XP + 2XL
96  :  (2X5:2X7)x
96= 10x+14x
x= 96/24
x= 4 cm

P= 5. 4= 20 cm
L= 7. 4= 28 cm

L= P X L
  = 20 X 28
  = 560 cm2

semoga membantu :)
2014-04-15T09:11:00+07:00
K = 96
p/l = 5/7--->> p= 5/7 x l

K= (2xp) + (2xl)
96= (2x5/7 x l) + (2xl)
96= 10/7 l + 2l
96= 10/7l + 14/7l
96= 24/7 x l
24l= 96x7
24l= 672
l= 672/24
l= 28

p= 5/7 x l = 20

L persegi panjang adalah= pxl = 20x28 = 560