Find the leg lengths of a triangle given hypotenuse?

Hello, I am 14 years old, in 8th grade, Pre-Algebra.

My math teacher isn't easy to approach (Grouchy, yells at you when you make a mistake etc.) so I can't ask her for help. I have a Pre-Algebra Exit Exam coming up and I am currently doing review homework and I can't find this in my notes anywhere (believe me I searched for a good couple hours trying to figure this out)

Long story short I need help!

"The hypotenuse of an Isosceles right triangle has a length of 9 meters. Find the leg lengths to the nearest hundredth of a meter."

I have absolutely NO idea how to go about this! Someone please help me. Much thanks in advance.