Interactive Conic Sections
This is an interactive website on cross sections. They are two-dimensional representations created at the intersection of a "slicing plane" and a three-dimensional object.
Interactive Graph of an Ellipse
This is an interactive graph of an ellipse. Features include sliders which can be moved to change the coordinates of the foci to explore changes in eccentricity and the lengths of major and minor axes.
Graph of a Parabola (Conic Section)
This is an interactive graph of a parabola as a conic section. The vertex, focus, and directrix of the parabola are displayed on the graph. A movable slider can change the distance between the focus and the vertex to explore the effect this distance has on the graph.