Jawabanmu

2014-02-17T18:02:19+07:00
2x lebar + 2x panjang = keliling, misal L = lebar dan P = panjang
2 x 5/7 P + 2P = 240
10/7 P + 2P = 240
10/7 P + 14/7 P = 240
24/7 P = 240
P = 240/ 24/7
P = 240 x 7/24
P = 70.
L = 5/7 P
L = 5/7 x 70
L = 50.
Luas tanah = L x P
= 50 x 70
= 3500 m2