Answer:
put a more clear pic
Step-by-step explanation:
It forms a cylinder.
Hope this helped.
x=13.7
CD=CB=6
AC=AD+CD => AC=9+6 => AC=15
AC^2= AB^2 + BC^2 => 15^2 = X^2 + 6^2 => 225 = X^2 + 36 => X^2 = 225 - 36 => X^2 = 189 => X=13.7