This cannot be a 45-45-90 right triangle because we don't have congruent sides. This cannot be a 60-60-60 for the same reason.
For a 30-60-90 right triangle, the shorter leg has a length of x, the longer leg has a length of

, and the hypotenuse has a length of 2x.
Let's test this. Let

Multiply that with


That matches the length of the longer leg.
Now, let's multiply x with 2 to see if it matches the length of the hypotenuse.

This matches the length of the hypotenuse. Thus, the angles are 30, 60, and 90 because this triangle is a 30-60-90 right triangle. Hope this helps! :)