1. 6.3 Use Similar Polygons

2. Similar Polygon
Two polygons are similar if their corresponding angles are equal and their corresponding side lengths are proportional

3. Similar Figures
Notice the corresponding sides are proportional ( in this case all are a 1:2 ratio) and the corresponding angles are congruent

4. Scale factor on polygons
The scale factor of a polygon can be found by creating a ratio with two corresponding sides of a polygon. This ratio should be reduced to its lowest terms.

5. Scale Factor
In our earlier example of two similar polygons the sides of 8 and 4 correspond. (both are the largest sides)
The scale factor is 18:9 or 2:1 when reduced
As a fraction 18/9 reduces to 2/1