P:l = 7:5 keliling 120m luasnya?= m

P = 35
L = 25
Luas = 35 x 25
        = 875 m²

2(7x+5x)=120
24x=120
X=5m
P=7.5=35m
L=5.5=25m
Luas=p.l=35.25=875m²