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I *think* it's B

Use Pythagorean theorem
\((5)^2+(5)^2=(diagonal)^2\)
\(diagonal=\sqrt{(5)^2+(5)^2}\)

yupp you need to use pythagorean theorem!

The answer would be 5√5?

The answer is B.

sqrt{(25)+(25)}=sqrt{50}=5sqrt{2}