Circle and center
- 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.