Answer:
You got it! line XY is the hypotenuse
Explanation:
Sorry if I over-explain this:
This is a drawing of a right triangle. Do you see the little box in the angle labeled Z? That box indicates that that angle is 90*, which is also called a right angle. When you have a right angle in a triangle, that triangle is called a right triangle.
In a right triangle, the line across from the right angle is called the hypotenuse.
Line XY is the line between points X and Y. Line XY is opposite the right angle so line XY is the hypotenuse.
It doesn't matter if the triangle looks like it's sideways, that little box is the important thing to look for. That always means right angle and therefore when you see that box in a triangle (no matter if it looks upside down or sideways), it's always a right triangle.