Jawabanmu

2014-04-06T21:30:39+07:00
K = 2pl
280 = 2 . p .3/4 p
280 = 3/2 p^2
p^2 = 280 . 2/3
p^2 = 186,7
p = akar 186,7
  = 13,7 cm
L = p x l
   = 13,7 . 10,3
   = 141,1 cm^2
2014-04-06T22:18:58+07:00
Kelilinh tanah 280m
Selisih panjang dengan lebar = 1 - 3/4 = 1/4
Penyederhanaan antara P : L = 4 : 3
Panjang  = 4/7 x 280 : 2 = 80
Lebar = 3/7 x 280 : 2 = 60
Luas = 80 x 60 = 4800m bjsk