Question

Congruent triangle proof help. Would appreciate any input on this proof. Want to learn from any mistakes. Thanks!

https://picasaweb.google.com/116556476041404991638/TriangleCongruenceProof?authuser=0&authkey=Gv1sRgCPHivaHY4vWXjQE&feat=directlink

Answer 1

@Walart1
The proof is conceptionally sound.
Two things:

1) When you write <A ≅<B, you need to specify which angle A and which angle B you mean. There are 3 different angles with vertex A in the diagram, and the same number for vertex B.

By <A, I think you mean <BAD and by <B, I think you mean <CBA.
There should be no confusion for the reader so you can name the angles by 3 letters.

Or you can add numbers on the diagram to refer to the two angles and reference them in your proof.

2) There is a segment bar missing on step 3.

Everything else looks good.

Answer 2

Ah yes, I see what you mean. I had a hard time knowing what to do about that very issue (specifying which angle A, etc.). I wasn't sure how to do that. It makes a lot of sense to name the angles by the 3 letters. For sure it will eliminate the confusion (for myself and others). Your suggestions are very helpful. Thank you!

Answer 3

Glad to help. You did a great job on the proof.