![](cone-cir.GIF) |
This image demonstrates what a circle is. Mathematically,
the circle is defined as the set of all points that are the same distance
from a given point. |
![](image29.gif) |
The equation for a conic circle is
. x, y, h, and k
are all shown in the image at left. |
![](http://www.flagline.com/images/novelty-earth.gif) |
The earth is a circle. |
![](TreeRing.gif) |
The ring's in wood are also in the shape of a circle. |
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