Because AC is not good at splitting angles,
So angle DAC= angle EAC.
AC = AC again
So triangle EAC is equal to triangle EAC.
Therefore, CE=CD=CB= 10. EB=2 1-9= 12
Therefore, triangle CBC is an isosceles triangle.
In the right triangle ECD
CE= 10,EF=EB/2= 12/2=6
Applying Pythagorean Theorem, we get CF= 19.
So AF=AE+EF=9+6= 15.
In a right-angled triangle cafe,
AF= 15,CF=8
Applying Pythagorean Theorem, we get AC= 17.