1. 4.7 Congruence in Overlapping Triangles

2. Having trouble deciding which triangles to choose?
Sometimes triangles overlap, you may have to pull apart the different sets of triangles to recognize if a particular pair is congruent or not. Best way to treat these problems is to redraw the given picture. You may have to redraw the picture several times to arrive at a valid conclusion.
Having trouble deciding which triangles to choose?
Then choose triangles that you know something about from the given info.

5. B E D A C 1 4 2 3

6. 1 2 A B C D E

7. l m Q R S T P

8. E K J N M

10. A B C E D