A Way to Generate Ellipse and Hyperbola with Two Circles

Orginal Source: http://tube.geogebra.org/student/mIXihnk3p[br][br]This applet allows users to generate an ellipse and a hyperbola with two concentric circles.
A Way to Generate Ellipse and Hyperbola with Two Circles
– Wang Muran, HoFH

Information: A Way to Generate Ellipse and Hyperbola with Two Circles