# Dilating a Point (Intro)

- Author:
- John Williams, Tim Brzezinski

- Topic:
- Dilation

The following applet illustrates what it means to dilate a point about another point.
You can move

**point**and*O*(the center of dilation)**point**anywhere in the plane. You can also change the*A***scale factor (**of this dilation by either moving the slider or by typing it in the white box at the top of the applet.*k*)*A' =*the image of point*A*under dilation about point*O*with scale factor*k*.**Interact with the applet below for a few minutes***BEFORE*clicking the "Check This Out!" checkbox in the lower right corner.2) Click the "Check This Out!" box now. Move point(s) *O* and *A* around. Be sure to
adjust the scale factor (*k*) of this dilation as well. Describe what you observe.