Examine the two triangles at right.  

1. Are the triangles congruent? Justify your conclusion. If they are congruent, complete the congruence statement $ΔDEF\;\text{_____}$.

   Hint (a):

   Use the Triangle Angle Sum Theorem to help find the missing angles, then determine whether or not the triangles are similar.

2. What transformation(s) are needed to change $ΔDEF$ to $ΔLJK$?

   Answer (b):

   Reflection and rotation.

3. If $DE=4$ units, find $KL$.

   Hint (c):

   Use the Law of Sines to solve for $KL$.