1. 4-1: Congruent Figures

2. Congruency Congruent figures have the same size and shape.

3. Congruent Polygons -Congruent polygons have congruent corresponding parts – their matching sides and angles. X A B C Q R Y P ‹X ‹Y ‹B ‹Q ‹C ‹R ‹A ‹P = ~ = ~ = ~ = ~ ‹XB ‹YQ ‹BC ‹QR ‹CA ‹RP ‹AX ‹PY = ~ = ~ = ~ = ~ XBCA YQRP = ~

4. Corresponding Angles and Sides? A BC D E F G H ‹A ‹G ‹D ‹H ‹C ‹E ‹B ‹F = ~ = ~ = ~ = ~ ‹AD ‹GH ‹DC ‹HE ‹CB ‹EF ‹BA ‹FG = ~ = ~ = ~ = ~ ADCB GHEF = ~

5. Solving for a variable. C A P S E R W B D T 88° 132° x 88° 5 sides -2 = 3 * 180 = 540° total in the shape. 90 + 90 + 132 + 88 + x = 540 400 + x = 540 x = 140°