Keliling sebidang kebun 280 meter. jika panjang kebun 1 1/3 x lebarnya ,brp cm luas kbn trsbt ?

jawaban ada di lampiran

K kebun = 280 m
K = 2 ( p + l )
p = 4/3 l l= ?
280 = 2 ( 4/3 l + l )
280 = 8/3 l + 2l
280 = 14/3l
l = 3/14 × 280
l = 60
panjang = 4/3 × 60 = 80 m
lebar = 60 m
Jadi luas = 80 × 60 = 4800. m^2