Can someone explain how to use AAS to create a congruent triangle using this "Measure two angles and a side of the triangle not connected to those angles."

So I already have two angles one is 25 and the other is 30. Can someone help now I already know one way is to just add them to 55 and subtract 55 from 180 and get 125, or to just measure the other angle with a protractor, but my teacher wants it to be explained a different way without doing those to things, can anyone help?