The conic sections have become a smaller and smaller part of high school math in the U.S. Nevertheless, they are interesting, and the advent of geometric construction software has made them more accessible. I share a fair amount of possibly useful materials about them on this site.

One conic section that's not going anywhere is the parabola. On my Parabolas and Quadratics page, I have links to much curriculum, ranging from Algebra 1 to "Teachers' Mathematics." The emphasis there is mostly on algebra. On this page, I mostly link to the *geometry of the conic sections.*

**Geometry of the Parabola**- In two dimensions (definition, construction, reflection property, all parabolas are similar)
- In three dimensions (the parabola really
*is*a conic section!) - Parabola Similarity (worksheet, using GeoGebra)

**Geometry of the Ellipse**- In two dimensions (two definitions, constructions, reflection property)
- In three dimensions (slicing a cone or a cylinder)
- Algebra connection (worksheet)

Paper-folding Conics (hands-on lab by Rachel Chou)

A related problem (surprisingly): Soccer Angles

Another surprise: the function diagram for `y=1/x`.