Jawabanmu

2015-12-30T23:59:30+07:00
A:t=6:5
a  =6/5t
Luas segitiga=1/2xaxt
135 cm²        =1/2x6/5txt
135 cm²        =1/2x6/5t²
135 cm²        =3/5 t²
135 cm²x5/3 =t²
225 cm²        =t²
√225 cm²      =t
√15cmx15cm=t
15 cm            =t
a=6/5t
  =6/5x15 cm
  =18 cm