1. How Scale Factor affects Perimeter
What if we enlarged the rectangle by a scale of 2:1, what is the perimeter then?
What if we enlarged the rectangle by a scale of 3:1, What is the perimeter?
Scale of 5:1, what is the perimeter?
Rectangle C
2 cm
5 cm

2. Carnegie 11.3 Number 17
Determine which scale would produce the largest scale drawing of an object. 1: m: 1 cm 1cm: 2 m

3. Carnegie 11.3 Number 30
The height of a sycamore tree is 65 ft. The height of a scale model of the tree is ft. What is the scale of the model?

4. Similar and Congruent Triangles

5. Dilations
Transformations that produce images that are the same shape as the original, but not the same size.
So they are similar but not congruent.

6. 9.1 (8th) Number 3

7. Example 1

8. The Side-Angle-Side (SAS) Similarity Thm
If 2 pairs of corr. Sides of ‘s are proportional and the included angles are congruent, then the ‘s are similar.

9. 9.3 (8th) Number 3