1. Congruent Polygons Lesson 4.1

2. ABCDE AEDCB Naming polygons A B C D E Pick a letter. A Pick a direction. AB AE Keep going until you get back to the beginning BCDEA BAEDC CDEAB CBAED DEABC DCBAE EABCD EDCBA

3.  The angles correspond to their position in the name: Pentagon ABCDE Pentagon ROUGH Corresponding angles angle A matches up with angle R angle E matches up with angle H angle B matches up with angle O angle D matches up with angle G angle C matches up with angle U

4. Corresponding sides  The sides correspond to their position in the name: Hexagon ASDFGH Hexagon ZXCVBN side AS and side ZX side CV and side DF side HA and side NZ

5. Polygon congruence postulate Two polygons are congruent iff there is a correspondence between their angles and sides such that: Each pair of corresponding angles are congruent Each pair of corresponding sides are congruent

6. A B C D E F ΔABC is congruent to ΔFED ΔCAB is congruent to ΔDFE

7. More examples Name the corresponding side and angles. ABCD is congruent to WXYZ ABCD is congruent to WXYZ W X W X Y Z Y Z A B A B C D C D