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2014-03-16T19:44:25+07:00
2L = 5/12 x 240
     = 5 x 20
     = 100
L = 100 : 2
   = 50
2 5 2
2014-03-16T19:46:17+07:00
Diketahui :
keliling = 240cm
p : l = 7 : 5

Misal :
p = 7x
l = 5x

2.(p+l) = 240
2.(7x+5x) = 240
2.12x = 240
24x = 240
24x= 240
24    = 24
x  = 10

Panjang : 7 . 10 = 70cm
Lebar = 5 . 10 = 50cm

2 5 2