Answer:
11.2 in
Step-by-step explanation:
The product of distances to the near and far intersection points with the circle is the same for any secants intersecting at a given external point. A tangent is the degenerate case where the near and far points of intersection are the same. This means ...
(9)(9) = (5)(5 + y)
81/5 = 5 + y
16.2 -5 = y = 11.2 . . . . inches
