CIRCLE - a graphics statement that draws an ellipse or circle
         with a specified center and radius
Syntax
  CIRCLE [STEP] (x,y),radius[,[color][,[start][,[end][,aspect]]]]
    - (x,y) are the screen coordinates of the center of the circle or ellipse
    - radius, a numeric expression, is the radius
    - Use STEP if x and y are offsets from the current cursor position,
      rather than absolute screen coordinates
    - start and end can be used to draw arcs
    - color and aspect are <DETAILS>
 
See Also  <SCREEN STATEMENT> - to find out about the different screen
                               coordinate systems that are available
          <LINE>