Respuesta :

The triangle in the picture is a right triangle and we can relate the sides length with the Pyhtagorean theorem:

[tex]\begin{gathered} x^2+13^2=16^2 \\ x^2+169=256 \\ x^2=256-169 \\ x^2=87 \\ x=\sqrt[]{87} \end{gathered}[/tex]

Answer: x = √87

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