Respuesta :

Let's first calculate the lenght of the side of the rectangle.

[tex]l=\sqrt[]{8^2+5^2}=\sqrt[]{64+25}=\sqrt[]{89}[/tex]

so we get that the dotted line is:

[tex]d=\sqrt[]{2^2+89}=\sqrt[]{93}[/tex]

so the answer is square root of 93