yang bantu semoga masuk surga

c. 6 maaf kalau salah

ABC
AB = AB
BC = 12cm
CA = 9cm
EBD
EB = 9cm
BD = BD
DE = 6cm

ditanya : BD ?

BC/BD . CA/DE
12/BD . 9/6
12.6 = 9.BD
72 = 9.BD
72/9 = BD
8 = BD

jadi jawabannya 8 (A)