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Unit 1 – Day 4

Unit 1 – Day 4. Dilations. Warm Up. Individually, rewrite your definitions WITHOUT using the vocabulary term. Then sketch a picture of each. Isometry Translation Reflection Rotation e.g. Rotation is not “rotating an object”. 10 minutes. End. Warm Up.

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Unit 1 – Day 4

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  1. Unit 1 – Day 4 Dilations

  2. Warm Up Individually, rewrite your definitions WITHOUT using the vocabulary term. Then sketch a picture of each. Isometry Translation Reflection Rotation e.g. Rotation is not “rotating an object” 10 minutes End

  3. Warm Up Turn to page 204 and complete the “Summarize the Mathematics” section. You may work with your group but individual answers must be recorded on your warm up sheet. 10 minutes End

  4. Dilation Definition: A Dilation is a transformation that resizes a figure. It can get bigger or smallerbut is still the same shape. Does a dilation have the property of isometry?

  5. All Dilations have a scale factor Definition: A Scale Factoris how much a figure changes in size

  6. Think About the Situation

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

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

  9. General Rule for Dilation Dilation by scale factor c (x, y)  (cx, cy) or (x, y)c(x, y)

  10. Group Work You will be working as a group on Problems 3 – 5. Time Keeper/Recorder: Set 10 minutes for each problem. Resource Manager: Obtain Handout 5 when needed Reader: Read instructions and questions. Spy Monitor: Teacher book available at front.

  11. 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.

  12. Assessment 3-2-1: Write down 3 things you learned today, 2 things you have a question about, and 1 thing you found interesting Homework: Worksheet (odds or evens)

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