Answer:
16
Explanation:
Alright we know that B is 8. Parallel to that B is line C and we can tell that the both of those are the same length.
That means we already have C and now we need a solution for D but that's the thing, we can just do what we did for C.
For D it's just a continuation of the B line so which is divided down the middle of the circle. That means that the other side, D, is also 8.
C+D=DC
8+8=16
DC=16
Hope that makes sense,
Your friendly neighborhood struggling student
Toodles ✌