This problem was in my Algebra 2 book, but it resembles a geometry problem so IDK...anyways. The problem is I need to find the area of a triangle that has the 5 and 6 meter legs, and whose hypotenuse is unknown. How do I solve this?

It seems simple, but I got into so many square roots I think I'm wrong.

BTW, the answer is 15m squared, but I have to show work so...