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This category contains definitions related to Circles.
Related results can be found in Category:Circles.

In the words of Euclid:

A circle is a plane figure contained by one line such that all the straight lines falling upon it from one point among those lying within the figure are equal to one another;

(The Elements: Book $\text{I}$: Definition $15$)


Pages in category "Definitions/Circles"

The following 110 pages are in this category, out of 110 total.