Answer:
![5√(2)](https://img.qammunity.org/2023/formulas/mathematics/college/nk3ziugy4hstv9m82mpadgl5s7x1z8zux6.png)
Explanation:
Draw a diagonal (line segment from one corner to the opposite corner). You'll form two right triangles with the diagonal being the hypotenuse of both triangles.
Use the Pythagorean Theorem: (leg)^2 + (leg)^2 = (hypotenuse)^2.
Let h represent the length of the hypotenuse.
![h^2 = 5^2+5^2\\h^2=25 + 25\\h^2 =50\\h=√(50)\\h=5√(2)](https://img.qammunity.org/2023/formulas/mathematics/college/7z5huj4jeuc3raiky0yq9ptiitxazhqfg3.png)
The question is just a bit vague. It should say opposite corners. I'm assuming the question does not mean the length of one side!