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Home > CCG > Chapter 9 > Lesson 9.1.1 > Problem 9-13

9-13.

Multiple Choice: What information would you need to know about the diagram at right in order to prove that by ?  

  1.  

  1.  

  1.  

  1.  

  1. None of these

Triangle A, B, C. Two internal triangles are created by a line segment A, D drawn from the upper vertex to the base at right angles.

(a)

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