Answer:
21
Step-by-step explanation:
In the figure attached, the diagram is shown.
The following equation must be satisfied:
AB * AD = AC * AE
where the length of AB is:
AB = AD + DB
Combining the equations:
(AD + DB)* AD = AC * AE
Replacing with data:
(6 + 8)* 6 = AC * 4
AC = 84/4
AC = 21
