Point - Circle

How to Use this Applet

The Graph Area

  • Drag any highlighted location on the circle ( • ) to move that location along the circle.
  • Drag the center of the circle ( ) to re-position the circle.
  • <SHIFT>+drag the center of the circle ( ) to re-position the circle horizontally or vertically.
  • Drag the other highlighted location ( ) to adjust/change the tangent(s) (outside the circle) or the chord (inside the circle).
  • <SHIFT>+drag the other highlighted location ( ) to adjust/change the tangent(s) (outside the circle) or the chord (inside the circle). The determining location can be moved horizontally of vertically.
  • Drag any non-highlighted location on the circle to change the radius of the circle.

Other

  • Use the "RESET" button to restore the applet to the initial state.