Jawabanmu

2014-02-27T22:33:51+07:00
81 /2=5x+4x 40,5=9x x=4,5 panjang=5×4,5=22,5m lebar=4×4,5=18m luas=22,5×18=405m kuadrat
2014-02-27T22:53:55+07:00
Keliling = 2(panjang+lebar) 81 = 2 (5x + 4x) 40,5 = 9x 4,5 = x panjang sebenarnya= 5x= 5.4,5 = 22,5 lebar sebenarnya= 4x = 4.4,5 = 18 Luas= p . l= 22,5 . 18 = 405 m^2