One angle of a triangle is twice another, and the sides opposite these angles have lengths 15 and 9.  Compute the length of the third side of the triangle.
Question:
One angle of a triangle is twice another, and the sides opposite these angles have lengths 15 and 9.  Compute the length of the third side of the triangle.
Answer:
Let's think step by step.

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16
One angle of a triangle is twice another, and the sides opposite these angles have lengths 15 and 9.  Compute the length of the third side of the triangle.
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