Answer:
[tex]5\sqrt{5}[/tex]
Step-by-step explanation:
If you apply the Pythagoras theorem you get that
[tex]6^{2} +8^2=x^2\\\\36+64=x^2\\\\x^2=100\\\\x=10[/tex]
with x= A D
and get apply it again
[tex]10^2+5^2=y^2\\\\100+25=y^2\\\\125=y^2\\\\5\sqrt{5} =y[/tex]
with y = A F
and that's our answer
Option D
