1. 11.7 Dilations/Rotation
Objective: Students will be able to explain if a figure’s dilation will be an increase or decrease based on the scale factor. They will also be able to use the scale factor to draw a dilation given a scale factor.

2. Notes
Dilation: transformation that enlarges or reduces a figure by a scale factor.
Scale factor (k): increases / decreases figure.
Size and shape increase/decreases.
Area and perimeter affected

3. Notes Enlargement Reduction Increase in size Scale is higher than 1
Decrease in size
Scale less than 1

4. Scale the figure and give new vertices
Vertices A(-2,4) B(4,4) C(2,-2). Scale of ½.

5. Rotation Notes Rotation: figures rotates around a “center of rotation”
Called a “turn”
Same size and shape.

6. Scale the figure and give new vertices
Vertices: A(1,2) B(0,0) C (2,-1). Scale of 2.

7. Scale the figure and give new vertices
Vertices A(0,0) B(2,4) C(6,-4). Scale of ½ .

8. Vertices: A(-1,1) B(2,2) C (2,-2). Scale of 3.

9. Find the vertices and then graph

10. Find the vertices and then graph

11. Tell me if the graph is a translation/reflection/dilation or rotation.

12. Tell me if the graph is a translation/reflection/dilation or rotation.

13. Activity
1. Graph points and label Use scale and write new coordinates after dilation Create new graph and label new points Tell me if it’s an enlargement or reduction.

14. Wrap up Questions/Comments Ic: activity Hw: finish
Objective: Students will be able to explain if a figure’s dilation will be an increase or decrease based on the scale factor. They will also be able to use the scale factor to draw a dilation given a scale factor.

15. Describe the transformations