# Circle and center

- Author:
- Steve Phelps

## How well can you identify a circle and a circle's center?

Drag points A, B, C, D, and E so the ellipse is as close to a circle as you can make it.
Then drag the circle so the center is located at point O.
The "Closeness" to a circle is measured by the ECCENTRICITY of the ellipse (closer to 0, closer to a circle).
Enter your data in the google form at the bottom of the page.