Tlong bantu aku ka sma prnyaa

1. AB per BC = AD per DF
9 / BC = 6/8
6BC= 8×9
BC = 12

2. AC/AB = DC/ED
4+DC / 12 = DC/9
36+9DC = 12DC
36=12DC—9DC
36=3DC
DC= 12

3. Kurang bisa (maaf)