# Circle

Circle[{x,y},r]

represents a circle of radius r centered at {x,y}.

Circle[{x,y}]

gives a circle of radius 1.

Circle[{x,y},{rx,ry}]

gives an axis-aligned ellipse with semiaxes lengths rx and ry.

Circle[{x,y},,{θ1,θ2}]

gives a circular or ellipse arc from angle θ1 to θ2.

# Details

• Circle with its different parameter settings is also known as arc, circular arc, semicircle, and ellipse.
• Circle can be used as a geometric region and a graphics primitive.
• Circle[] is equivalent to Circle[{0,0}]. »
• Circle represents the curve .
• Angles are measured in radians counterclockwise from the positive x direction.
• Circle can be used in Graphics.
• In graphics, the point {x,y} and radii r and {rx,ry} can be Scaled, Offset, ImageScaled, and Dynamic expressions.
• Graphics rendering is affected by directives such as Thickness, Dashing, and color.

# Examples

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## Basic Examples(5)

A unit circle:

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A circular arc:

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An ellipse:

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Differently styled circles:

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ArcLength of a circle:

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Length or circular arc:

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