When does Angle Side Side work?

D E and F are constructed to correspond with triangle ABC via "Angle-Side-Side". In other words, they share two congruent sides and a non-included angle. Angles D and A are congruent Segments DE and AB are congruent Segments EF and BC are congruent.
1. When does Angle-Side-Side "work" as a congruency shortcut? 2. When does it not work? 3. What happens when it does not work? More Geogebra materials at www.scottfarrar.com/blog Twitter @farrarscott https://twitter.com/farrarscott