As a teacher I would use this for demonstration purposes. If time is available, show first the construction to dilate the line segment by a factor of "d" in a new Geogebra file, where "d" is a slider set up as a number with values from 0 to 5. This way they can see what it means to dilate a line segment, and then make the extension to dilating several line segments at one time. Then we would have a class conversation around what different ratios will be when entered into the spreadsheet. We will also predict which angles will be congruent, and then verify using the angle construction tool. To make use of this you will want to download this file instead of going to the student worksheet.

1. What is another way to name segment b? Segment e?
2. Write a statement of proportionality that applies to this diagram no matter what the scale factor is.