Clever Circles

Like yesterday, buying gas. I started spinning this credit card advertisement and something about it didn’t make sense. I stared at it, cocking my head back and forth like a magpie. Then I saw the two different radii and laughed at myself.

A year ago, that would’ve ended it, but nowadays – I don’t know. Even during the summer, I can’t turn this thing off, this thing which I tried to illustrate in my second vodcast. I grabbed my Canon PowerShot and shot some video. Then I dumped it into Adobe AfterEffects and added some clarifying visuals.

I’ll play it someday next year at some moment when I’d like them to scratch their heads over how one circle has more circles inside of it. I’ll ask them to make their own, maybe, or maybe we’ll just enjoy the moment, a moment when we brought the world into our math class with video.

Clever Circles from Dan Meyer on Vimeo.

I'm Dan and this is my blog. I'm a former high school math teacher and current head of teaching at Desmos. He / him. More here.


  1. This English teacher needed to watch the vid 4 times to finally grab the I got it rung.

    Then again, I was watching TV @ same time. Do I get a nice goin’ award?

    Either way, love how you worked the AfterEffects magic to illuminate this hidden gem. Otherwise I’d still be on viewing #73 (and counting), still trying to figure out why DIY math vids were supposedly so cool.

  2. This is what I love about the potential of video – things that kids see everyday that they don’t necessarily relate to education, but the light can come on so quickly with familiarity with the subject…