I'll be speaking at the California Association of Independent Schools conference, on March 8 in North Hollywood. Two presentations:The Geometry of Conic SectionsSpace: An Advanced Geometry Elective After Algebra 2If you teach at a member school, I hope to see you there!--Henri

# Tag: Electives

## 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

## Worksheet Tweaks

Because of feedback from participants in my "No Limits!" workshop last summer, I tweaked some worksheets:- Graphing Square Roots- Quadratic Forms- A Different Approach to the Quadratic Formula(The latter two can be found on the Parabolas and Quadratics page.)--Henri

## 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

## Space

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

## Abstract Algebra, follow-up

I added a paragraph to the Abstract Algebra Teachers' Guide, just in time for my NCTM presentation in DC. I'll be speaking on my Space class, and expect at least some of the participants in my workshop to head to that page on my site.The talk is Saturday, April 25, at 12:30 p.m., during the… Continue reading Abstract Algebra, follow-up

## Abstract Algebra

Not long ago, I received some advertising for class sets of Rubik's cubes, which are sold along with a solving method. Soon afterwards, a correspondent wrote:I see on your website that you have done some work with kids on Rubik's cubes and group theory. I have purchased a class room sets of the Rubik's Cubes… Continue reading Abstract Algebra

## Complex Numbers

I added the core of a unit on complex numbers to the Algebra 2 page.Like some other materials I've written over the years for my students at the Urban School of SF, these lessons were inspired by the pioneering work of Stein, Crabill, and Chakerian (see their out-of-print Algebra II/Trig book.)From the intro to the… Continue reading Complex Numbers

## The Final Frontier

I updated the page on my Space post-algebra 2 advanced geometry elective. I added a fair amount of additional details based on this year's iteration of the course.I also gave a talk about the course today, which suffered from a bit of a tech meltdown at the end, as I had trouble going back and… Continue reading The Final Frontier