Key Concept
Once you have proved that two triangles are congruent, you know that their corresponding parts must be congruent as well. This will allow you to find the unknown measures of angles , objects and distances, as well as prove that constructions of copying angles are valid.
Goal: Use congruent triangles to prove corresponding parts congruent.
TRY: In class work
pg 259 #'s 1, 3-5 all
