1. Unit 1: Transformations Day 5: Dilations

2.  Warm-up  Homework Check  Notes/Activity  Independent Practice

3. Individually, rewrite your definitions WITHOUT using the vocabulary term. 1. Isometry 2. Translation 3. Reflection 4. Rotation e.g. Rotation is not “rotating an object”

4.  One at a time:  1 person close your eyes for 15 seconds.  The other person, watch their eyes as they open.  Write down what you notice.  Repeat with other person.

5.  A dilation occurs when you resize a shape  It can get bigger or smaller. but it still looks similar, meaning all angles stay the same and relative sizes are the same  Does a dilation have the property of isometry?

6. All Dilations have a scale factor Scale Factor – describes size change

7. http://www.mathopenref.com/dilate.html

8.  The dilation is an enlargement if the scale factor is greater than 1. enlargement  The dilation is a reduction if the scale factor is between 0 and 1.reduction

9. Does that work for B to B’ and C to C’?

10. *c is called the scale factor

11. A’ or A need to be either the x’s or the y’s of one coordinate, Unless the values are zero.

12. Page 676-678 #7-14, 18-20, 32-35, 38,39, 42

13.  Come up with an example or a time you would see or use a dilation in the real world.

14.  Dilation Worksheet