In triangle $ABC$, $AB = 9$, $BC = 12$, $AC = 15$, and $CD$ is the angle bisector.  Find the length of $CD$.
Question:
In triangle $ABC$, $AB = 9$, $BC = 12$, $AC = 15$, and $CD$ is the angle bisector.  Find the length of $CD$.
Answer:
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4 \sqrt{10}
In triangle $ABC$, $AB = 9$, $BC = 12$, $AC = 15$, and $CD$ is the angle bisector.  Find the length of $CD$.
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