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Krotus

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I am writing a piece of software where the user can select a polygon of 3, 4, 5, 6 or 8 sides. All of the polygon points are equidistant from the x, y point. In other words, if you drew a circle where the center was the x, y point, all of the points of the polygon would line on the circle.

That means, obviously, that the distance of each polygon point is equal to the imaginary circle's radius.

Given that information, what are the equations to create each type of polygon's set of points?