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2006 AMC 10A Question 23

AMC10 · 2006 AMC 10A

Question 23

Circles with centers $A$ and $B$ have radii $3$ and $8,$ respectively. A common internal tangent touches the circles at $C$ and $D,$ as shown. Lines $AB$ and $CD$ intersect at $E,$ and $AE = 5.$ What is $CD?$

Question illustration
  1. $13$
  2. $\dfrac{44}{3}$
  3. $\sqrt{221}$
  4. $\sqrt{255}$
  5. $\dfrac{55}{3}$