Section 2

Discover

Have you used the zoom feature on a computer monitor? You may have used this device to enlarge small print. In Try This 1, you will identify patterns between the percentage of zoom and the change in an object's size.

Try This 1

1. Set the zoom feature to 100%. Measure the width and height of the eagle image with a ruler—use millimetres (mm). Record the measurement in a chart similar to the one shown.
   
   
2. Use “zoom” to enlarge and reduce the image to match the zoom setting in the chart. For each zoom setting, measure the height and width of the eagle image. Record all your observations.
   
   
   iStockphoto/Thinkstock
   
   

   Zoom Setting	Width	Height	Ratio   Width Height	Reduced Ratio   Width Height
   100% (original)
   50%
   25%
   150%
   200%

   
   
3. Does the zoom feature change the drawing's overall shape? Why or why not? How do you know?
   
   
4. Does the ratio between the width and the height change in the table? How do you know? Add another column to the chart so you can confirm your answer.
   
   
5. How does “zoom” affect the dimensions of the original drawing?

Save your responses to your course folder.

Share 1

Share your responses to the questions in Try This 1 with a classmate or with a group of people.

• How did the patterns observed in each table compare to yours? What patterns did you discuss that were new to you?

If required, save a copy of your discussion in your course folder.