jika panjang AB=9cm CD=3cm CE=5cm,maka panjang CD adalah a.12cm b.15cm c.18cm d.21cm

[tex] \frac{CE}{BE} [/tex] = [tex] \frac{CD}{BA} [/tex]
[tex] \frac{5}{3} [/tex] = [tex] \frac{CD}{9} [/tex]
3 CD = 5 x 9
3 CD = 45
CD = 45 : 3 
CD = 15 cm