# Dilations Part 1: What Do You Notice?

## Interact with the app below for a few minutes. Have fun exploring! (LARGE POINTS, the slider, and Lisa's pic are moveable.)

In the app above, Lisa's pic is said to be **dilated** about **point A** by a **scale factor k**. What does a dilation seem to do to Lisa's original pic? What can it do? Describe.

In the app below, use the **line tool **to construct and Then move ** A**,

**, and**

*B***around a bit. Move the slider as well. What seems to be true about the two lines?**

*C*Use the tool(s) of GeoGebra to prove your assertion is true. Then explain how what you did shows your claim is indeed true.

So when we dilate a line about a point (with a scale factor ) , its image is another line that __________ the original (pre-image) line.

So when we dilate a line about a point with a scale factor , its image is another line that __________ the original (pre-image) line.