Answer:
Two tangents intersecting a circle are always equal.
Therefore 4x + 11 = 13x - 16
Solving for x: 9x = 27
x = 3
ED = 4x + 11 = 12 + 11 = 23
IF FDE is a right triangle:
FD^2 = 23^2 + 12^2
FD^2 = 529 + 144
FD^2 = 1,202
FD = 34.6698716467
FD = 34.7 (rounded)
Explanation: