9.8 The letter R Expands, Contracts and goes Negative!
Student's page

  1. Open File in Geometer's Sketchpad: http://www.ciese.org/ciesemath/R.gsp

  1. You should see this:

 

3. What are the coordinates for points: 


 
In the chart above:
Dilation is defined as a transformation that shrinks or enlarges an image (the preimage).

Use Sketchpad to dilate R so its coordinates will correspond to the ones in your table above.
 
  1. Double click on (0,0).

  1. Go to the transform menu and choose DILATE you should make the fixed ratio 2/1

  1. dilate.jpeg


  1. You should now see this:



  2.  

  1. Repeat for 1.5 times. Where do you expect the R to appear?

  2. Did you predict this?



  1. See if you can predict where the last dilation (-.5) will land?

  2. Did you expect this?