Tolong di bantu ya sama cara kerjanya

[tex] \frac{dc}{ef} = \frac{ef}{ab} [/tex]
[tex] \frac{4}{ef} = \frac{ef}{16} [/tex]
kali silang
[tex] {ef}^{2} = 64[/tex]
[tex]ef = \sqrt{64} [/tex]
[tex]ef = 8[/tex]

Jawabanya adala b/8 cm