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# Seth is using the figure shown below to prove Pythagorean Theorem using triangle similarity.

In the given triangle ABC, angle A is 90° and segment AD is perpendicular to segment BC.

**Part A:** Identify a pair of similar triangles. (2 points)

**Part B:** Explain how you know the triangles from Part A are similar. (4 points)

**Part C:** If DB = 9 and DC = 4, find the length of segment DA. Show your work. (4 points)

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