CPM Homework Help : INT2 Problem 2-42

Examine the two triangles at right.

Are the triangles congruent? Justify your conclusion. If they are congruent, complete the congruence statement $ΔDEF$ _____ .
Hint (a):
Use the Triangle Angle Sum Theorem to help find the missing angles, then determine whether or not the triangles are similar.
What sequence of transformation(s) will map $ΔDEF$ onto $ΔJKL$ ?
Answer (b):
Reflection and rotation.

Triangle, D E F, labeled as follows: angle, e, 70 degrees, angle, f, 60 degrees, side, D E, has 1 tick mark. Triangle, J K L, labeled as follows: angle, j, 70 degrees, angle, L, 50 degrees, side, J L, has 1 tick mark.