Respuesta :

ANSWER

FD = 27

EXPLANATION

By the tangent-secant theorem:

[tex]FG^2=EF\cdot FD[/tex]

So we have:

[tex]\begin{gathered} 18^2=12\cdot FD \\ FD=\frac{18^2}{12} \\ FD=27 \end{gathered}[/tex]