Respuesta :

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Answer:

AB=12    BC=9

Step-by-step explanation:

Any side of a triangle must be shorter than the other two sides added together.

AB and A'B' must measure LESS than  the other 2 sides

  15 is 3/4 of 20

   12 is 3/4 0f 9

 

20/15   12/9    = 1.3333333........

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