$XY=10 \sqrt 2$
Work Step by Step
Using the Special Right Triangle 45-45-90 we know that both legs will be equal. So... $XZ=ZY=10$ The third side, or the hypotenuse will be the side length times $\sqrt 2$ Therefore... $XY=10 \sqrt 2$
You can help us out by revising, improving and updating this answer.Update this answer
After you claim an answer you’ll have 24 hours to send in a draft. An editor will review the submission and either publish your submission or provide feedback.