keliling 280 meter. panjang kebun 4/3×lebarnya. berapa luasnya?...cm2 Pake cara ya mohon dibantu

kll = 2(p+l)
280m= 2(4/3l+l)
280m/2 = 4/3l + l
140m = 7/3l
140m : 7/3 =l
140m × 3/7 = l
60m = l

p= 4/3 × l
= 4/3 × 60
= 80m

L = p × l
= 80m×60m
=4800m²
=48cm²