This document provides a review of similar polygons from geometry. It discusses that two polygons are similar if their corresponding angles are congruent and their sides are proportional. Both the angles needing to be congruent and the sides proportional must be true for the polygons to be considered similar. The document also reminds the reader about the criteria for triangle congruency from earlier lessons.

1. Geometry Warm up:
pg. 570 # 18-21

2. 11.1 Similar Polygons pg. 563 -570
RECALL from chapter 4 -- Congruency..
You learned specifically that TRIANGLES are ≅ if they meet
certain criteria:
SAS SSS ASA AAS
(AAA and ASS or ASS backwards did NOT work)
What did you have to do?
-Compare 2 triangles
-See if pieces matched in a specific order
-Declare them ≅
-Then the remainign pieces were CPCTC

3. This time we are not concerned about ≅ but we are concerned about
similarity!
2 figures are congruent if they are the same exact size and shape
2 figures are similar they are the same shape but their sides are
proportional
(think Xerox machine)

4. Polygons are similiar IF and ONLY IF their corresponding angles are ≅
AND their sides are proportional!