## The Dress – Why do I see the wrong colors?

By now, you have seen the dress. This dress, by the way, is undeniably, and actually, Blue and Black. If you’re like me, you see White and Gold (in shadow!) If you’re like many others, you see Blue and Black. If you’re like some, you see Periwinkle and Gold. But the real dress has beenRead More

## Huge soccer project about to take off!

Inspired by this post from Geoff Kraal, I am going to spend the next five class days (80 minutes each) plus homework time working on a large-scale project in which my three geometry classes will build small, child-size soccer goals out of PVC pipe. When we’re finished, the goals will be given to faculty childrenRead More

## Now I have to assess this unit…

…and I really don’t know how. The problems are great, but I’m not comfortable (yet, I hope) grading them as high-value summative assessments, which means that I don’t have a “reasonable” distribution of grades. I could spend a day consolidating our knowledge from the problems and short-lectures – areas of various shapes, similarity theorems, scalingRead More

## Tonight’s Homework – Octagon Patios

I’ll admit, I thought tonight’s homework problem wouldn’t be so hard after tackling the Tennis Court problem and Geoff Kraal’s Pizza Casbah Challenge problem. But I’m getting a lot of stressed e-mails from confused students (who have not learned to embrace confusion I guess), so we’ll see how it goes. Here it is. Still stressingRead More

## Painting tennis courts – scaling and rectangular areas

I don’t like how our book (and I assume most geometry books, at least traditional ones) breaks up similar polygons – which I think of in terms of scaling and maps – and the areas of those polygons. So I’m combining them. A couple of days after the light problem, we started a series ofRead More

## It begins – measuring our field’s flood lights

I’m going to dive right in. I am back to teaching high school math this year, after a few years teaching middle school science, and I did a mediocre job first semester. My AP stat class was muddled and confusing and my geometry classes were boring and uninspired. We’ve been back in class a weekRead More