help/circle_by_radius.html

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  <h2>Add a Circle by Radius </h2>
  <br />
  <div id="supi"><img src="images/circler.gif" alt="" width="29" height="28" border="1" align="left" /></div>
  <p>Click three points to construct a circle. The first point is as the  center of the circle. The other two points serve as the diameter of the  circle.</p>
  <p>&nbsp;</p>
  <p> To draw a circle with given radius AB and the  center C, points A and B must be aready constructed. Click A, then B.  Then click again. The circle (C, AB) is drawn. </p>
  <p><img src="images2/circled.gif" alt="circleD" height="150" width="150" /></p>
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