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Circle
Circle[
x
,
y
,
r
] is a two-dimensional graphics primitive that represents a circle of radius r centered at the point x, y.
Circle[
x
,
y
,
,
] yields an ellipse with semi-axes  and  .
Circle[
x
,
y
,
r
,
,
] represents a circular arc.
Angles are measured in radians counterclockwise from the positive  direction.
Circle[
x
,
y
,
,
,
,
] yields a segment of an ellipse obtained by transforming a circular arc with the specified starting and ending angles.
Scaled[
,
] or Scaled[
,
,
,
] can be used in the radius specification. The  are in scaled coordinates, and the  are in absolute coordinates.
Offset[
,
] can be used to specify radii in printer's points.
The thickness of the circle can be specified using the Thickness primitive.
See the Mathematica book: Section 2.9.2, Section 2.9.2.
See also: Disk.
Further Examples
This displays a circle, an ellipse, and an arc of a circle.
Evaluate the cell to see the graphic.
In[1]:= 
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