Jawabanmu

2014-08-17T08:57:49+07:00
2014-08-17T09:02:23+07:00
P:l = 7:4
K= 132cm
2(p+l) = 132cm
2( 7y + 4y) = 132cm
14y + 8y = 132cm
22y = 132cm
y = 132cm : 22 = 6cm

L= p x l = 7(6) x 4(6) = 42 x 24 = 1008(c)