tolong dibantu pke caranya

Panjang EF :
AE/EC = EF/CD
3/4 = EF/32
4EF = 96
EF = 24 cm

Panjang AB :
AE/EC = AB/EF
3/4 = AB/24
4AB = 72
AB = 18 cm

Jawaban : C. 18 cm

Maaf Kalau Salah