How to Write Indirect Proofs for Triangle Congruence

The Organic Chemistry Tutor

This educational video provides a clear, step-by-step tutorial on how to construct indirect proofs in geometry, specifically focusing on triangle congruence. The narrator uses a digital whiteboard to walk viewers through two distinct examples. The first example involves two separate triangles, while the second features two triangles sharing a vertex in a "bowtie" configuration. The video demonstrates the logic behind proof by contradiction, showing how to assume the opposite of the desired conclusion to eventually find a logical inconsistency.