Jawabanmu

2014-03-24T20:27:23+07:00
2(5x+3x) = 96cm
2(8x) =96cm
16x =96cm
x = 96/16 = 6cm

P= 5x = 5(6) = 30cm
l = 3x = 3(6) = 18cm

Luas = pxl = 30x18 = 540cm²
        
2014-03-24T20:29:31+07:00
Panjang = 5x   keliling persegiu panjang = 2(p+l)
lebar = 3x

keliling = 96
2(p+l) = 96
2(5x+3x) = 96
2(8x) = 96
   8x = 48
     x = 6

panjang = 5(6) = 30
lebar     = 3(6) = 18
luas = p x l
       = 30 x 18
       = 540 cm²