Keliling sebidang kebun 280 meter. Jika panjang Kebun 1 1 /3dikali lebarnya, berapa cm ² Lucas kebun tersebut

jawab

K= 280 m
p = 1 1/3 l
4l = 3p

2( p+ l)  = 280
2 p + 2l = 280 ..klai 2
4p+ 4l = 560
4p + 3 p = 560
7p = 560
p = 80
4l = 3p
l = 3/4 x 80 = 60

Luas = p l = 80 x 60 = 48.000