Negative Radius

Slide the red dot to the value of r (positive or negative), then slide theta to the angle (between 0 and 2*pi) in radians. Observe the result when r is negative!

Sorry, the GeoGebra Applet could not be started. Please make sure that Java 1.4.2 (or later) is installed and active in your browser (Click here to install Java now)

Dave Matthews, April 9, 2007, Created with GeoGebra