tolong bantu jawab dong no 19 dan 20

Kelas 8 Matematika
Bab Kesebangunan

19] Sisi terpanjang ΔABC : sisi terpanjang ΔXYZ
= 16 cm : 8 cm
= 2 : 1

20] FC = (AB . CD + BC . ED)/(DC + CB)
FC = (20 . 4 + 6 . 5)/(6 + 4)
FC = (80 + 30)/10
FC = 110/10
FC = 11 cm