Page 3: CPCTC Crossword
The final page introduces the concept of CPCTC (Corresponding Parts of Congruent Triangles are Congruent) in triangle congruence proofs.
The first proof involves triangles LMO and NMO, with the given information:
The proof uses the SAS congruence theorem to establish triangle congruence, then applies CPCTC to prove that O is the midpoint of LN.
Highlight: CPCTC is a powerful tool in geometry proofs, allowing us to conclude that corresponding parts of congruent triangles are also congruent.
The second proof deals with triangles ACB and ECD, given:
- AB || ED
- C is the midpoint of AE
This proof employs the AAS congruence theorem and CPCTC to show that BC = DC.
Quote: "Corresponding Parts of Congruent Triangles are Congruent (CPCTC)"
The crossword puzzle format continues to reinforce the understanding of triangle congruence proofs while introducing the important concept of CPCTC.