Respuesta :

Stiaen
We have to use Pythagorean theorem that says : 

[tex]a^2+b^2=c^2\\\Rightarrow a^2+15^2=39^2\\a^2=39^2-15^2\\a=\sqrt{1296}\\a=36[/tex]

The missing length of the triangle is : 36 feet

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