Respuesta :

kelly1812

Answer:

x=13.7

Step-by-step explanation:

CD=CB=6

AC=AD+CD => AC=9+6 => AC=15

AC^2= AB^2 + BC^2 => 15^2 = X^2 + 6^2 => 225 = X^2 + 36 => X^2 = 225 - 36 => X^2 = 189 => X=13.7

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