Here's a simple applet that draws regular n-gons on a grid, while allowing the radius, number of sides, and angle of rotation of the n-gons, as well as the grid size (separation) to change. Choosing the maximum number of sides results in a circle instead of a polygon.
Here is a larger version that is more suited to desktop browsers.
Radius: |
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Separation: |
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# of Sides: |
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Rotation: |