Plotting circle in XY Graph

[~MSD~]

Hey, 

I have an example to plot a circle in XY Graph. I dont know which formula have been used to implement the same. Could anyone explain me? Please refer the attached image.

Thanks in advance.

[RavensFan]

Sine and Cosine.  Are you familiar with trigonometry?  The sine and cosine of an angle give the X and Y coordinates of a circle.

[udka]

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