Respuesta :

carlosego
For this case by similarity of triangles we can use the following relationship:
 (x) / (9) = (5) / (15)
 We clear the value of x:
 x = ((5) / (15)) * (9)
 Rewriting:
 x = (1/3) * (9)
 x = 3
 Answer:
 The value of x for this case is:
 x = 3

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