Home/Interactive Geometry – How to attach the perimeter of a circle to another object so the radius changes when the object moves?
## Interactive Geometry – How to attach the perimeter of a circle to another object so the radius changes when the object moves?

Method A

- Touch and select the perimeter of a circle.
- Drag the perimeter over the location for attachment (i.e., Point b in the following image) and pause for the popup to offer attachment options.
- Moving the line or moving Point b will result in the radius of the circle moving. In addition, moving the center of the circle Point a in the example below will also change the radius of the circle.

#### Share This Story, Choose Your Platform!