16.6.4 Paving the Way for Similarity: Invariants Under Scaling
Core ideaEnlarge or shrink a whole figure and parallels stay parallel, angles stay the same; this is exactly the doorway to our next stop, similarity
Module goal. Build on all the earlier proofs to distill a new tool of argument, proof by contradiction, and close out this stage with it, laying groundwork for the trickier reasoning in similarity