Jawabanmu

2014-04-24T12:48:03+07:00
Misal panjangnya 5a dan lebarnya 4a. maka kelilingnya = 2×(5a+4a)= 18a = 36. a=2. panjang = 10 m, lebarnya = 8m . luas = 10m × 8 m = 80 m persegi
2014-04-24T12:50:05+07:00
P= 5:9(36) = 20 , l=4:9 (36)= 16. L=p×l = 20×16= 320