PROVING A THEOREM Use the diagram to write a
proof of the Triangle Sum Theorem (Theorem 5.1).
Your proof should be different from the proof of the
Triangle Sum Theorem shown in this lesson.
A
1
B
2
3
4
с
5
D
E
![PROVING A THEOREM Use the diagram to write a proof of the Triangle Sum Theorem Theorem 51 Your proof should be different from the proof of the Triangle Sum Theo class=](https://us-static.z-dn.net/files/d59/eb95ac9a915de9f8edfd151f898dd4b0.png)