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Geometry – Honors

Geometry – Honors. Unit 1: Transformations Day 5: Dilations. Agenda. Warm-up Homework Check Go over Quiz Notes/Activity Independent Practice. Warm-Up. Individually, rewrite your definitions WITHOUT using the vocabulary term. Isometry Translation Reflection Rotation

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Geometry – Honors

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  1. Geometry – Honors Unit 1: Transformations Day 5: Dilations

  2. Agenda Warm-up Homework Check Go over Quiz Notes/Activity Independent Practice

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

  4. Homework Check

  5. Go Over Quiz

  6. In partners 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.

  7. Dilation • 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?

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

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

  10. What is the difference between an enlargement and a reduction? • The dilation is an enlargement if the scale factor is greater than 1. • The dilation is a reduction if the scale factor is between 0 and 1.

  11. How do you go from A to A’ Does that work for B to B’ and C to C’?

  12. Algebraic Rule for Dilations: *c is called the scale factor

  13. If given a preimage and an image how do you find the scale factor? A’ or A need to be either the x’s or the y’s of one coordinate, Unless the values are zero.

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

  15. Exit Ticket Come up with an example or a time you would see or use a dilation in the real world.

  16. Homework Dilation Worksheet

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