2. 9.6: Dilations

3. A dilation is an enlargement if the scale factor is greater than 1 and a reduction if the scale factor is between 0 and 1.

4. What is the scale factor?

5. What is the scale factor?

6. For us…center of dilation is always the origin

7. What would the new vertices of this image be after a dilation with scale factor 2?

8. What would the new vertices of this image be after a dilation with scale factor 1/2?

10. 19. The image of a button is 6 cm across and 5 times actual size…what is the actual size of the button?

11. Break time

13. 9.7: Similarity Transformations

15. What is the series of transformations to bring RST to PYZ?

16. What is the series of transformations to bring ABCD to NMPH?

17. A similarity transformation is a composition of rigid motions and/or dilations
Two figures are similar if and only if there is a similarity transformation from one figure to the other

18. Is there a consistent scale factor?
Why does it work?
Are angles congruent?
Is there a consistent scale factor?

19. Are these circles similar
Are these circles similar? Assume G has a radius of 15 and H has a radius of 12

20. Are ALL circles similar?

21. Is there a similarity transformation from PAQ to TNO
Is there a similarity transformation from PAQ to TNO? Not enough information?

23. What if the shapes aren’t polygons?

25. Homework: Section 9.6, pages 590-591: 7-9, 16, 17, 19
Honors: Add 36
Section 9.7, pages : 8, 9, , 15
Honors: Add 17, 18

26. 9.7

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