Geometry worksheet with three triangle congruence proof problems, each with diagrams and tables for statements and reasons.

Geometry worksheet titled "Geometry, Unit 5 - Congruent Triangles Proof Activity - Part I" featuring three problems with diagrams of triangles and tables for proofs. Problem 1 shows triangles ABC and DCE with given congruent sides BC ≅ DC and AC ≅ EC, and asks to prove ΔBCA ≅ ΔDCE using vertical angles. Problem 2 shows triangles KJM and KLM with given JK ≅ LK and JM ≅ LM, and asks to prove ΔKJM ≅ ΔKLM using reflexive property. Problem 3 shows triangles GFH and IFH with given ∠G ≅ ∠I and FH bisects ∠GFI, and asks to prove ΔGFH ≅ ΔIFH.