This is what it shows for the solution. Hope this helps.
-------------------------------------------------------------------------------------------------------------
Answer: 
-------------------------------------------------------------------------------------------------------------
Given: 
Find: 
Solution: The diagonal length can be easily determined using an equation which uses the side length of a square multiplied by the square root of 2. All we need to do is plug in the values and simplify the expression.
<u>Plug in the values</u>
<u>Simplify the expression</u>
Looking at the answer options that have been provided, the option that best fits our scenario is option A, 13.