Geometry of the Conic Sections, cont’d

New pages:Geometry of the Conic Sections (emphasis on the ellipse): 2D | 3DExtension of a geometry activity with interesting connections to the conics: Soccer AnglesUpdated page (not counting pages where I just added links):Geometry of the ParabolaNew worksheets for students (PDFs):A Geometric Construction Unit (Teachers' Guide)Geometry of the EllipseConics Graph Paper: Two Foci | Focus-DirectrixI… Continue reading Geometry of the Conic Sections, cont’d

Geometry of the Conic Sections

I posted a fair amount of material about the Geometry of the Conic Sections -- basically my December 5 Asilomar talk, supporting pages and documents, and more or less closely related material.Check it out, and follow the links, as there are quite a few new things to look at! Including Web pages, PDFs, images, and… Continue reading Geometry of the Conic Sections

Summer Workshops: Early Registration Deadline

Reminder: I will be teaching two workshops for teachers this summer, as part of the Center for Innovative Teaching (CIT) at the Urban School of San Francisco. See below for more details and links.The last day to take advantage of the 10% discount for early registration is June 4. You have three weeks (though some… Continue reading Summer Workshops: Early Registration Deadline


I added a fair amount of material to my Space page, in time for my presentation about the course this week at the NCTM National Meeting in DC. (If you're attending the meeting, my talk is Saturday, April 25, at 12:30 p.m., in Room 202B in the Convention Center.)--Henri