Posted by Anonymous on Tuesday, May 15, 2012 at 7:48pm.
Given that AB is a tangent of the circle with the center at X, AB = 12, and XD = 2.5, which is the length of DB

geometry  Reiny, Tuesday, May 15, 2012 at 9:35pm
No idea where A and B are on that tangent.
No idea where D is