## Monday, September 08, 2014

Breaking News: Kids struggle with fractions!
Alert: Kids can't describe how 3π/4 relates to π.
News at 11: Radians? What new torture is THIS?!

I tried something new today in precalculus to help cement the "special angles" around the unit circle. Based on the spontaneous comment of one of my students ("this REALLY helped."), I am hoping for greater and sooner fraction success this year.

First I madeand printed them on various colors of papers (one color for each special "radian"):

Each student trimmed the circles and pasted the yellow "unit circle" in their notebooks along with a blue slot to store wedges:

We then had a discussion about π/6 and I had them place various radians in standard position and we discussed reference triangles and values around the sides:

I made sure to do some negative angles:

We finally discussed the π/6 angles and worked through a problem:

Now I sit back and wait to see if THIS year they are fraction geniuses!

1. Love it, thanks!

2. Could you please start doing awesome lessons two days before I teach the same topic instead if two days after??? :) but at least I can keep this in my back pocket for May in alg II! Thanks for sharing!

3. Hah! Meg, funny story: I was rushing rushing rushing through radians and special triangles and unit circle, and then I actually went back to look at our plan (after the fact) of what/how/when my buddy teacher and I would teach stuff, and Lo and Behold, I was supposed to slow down and do something like this a day or 2 ago. Oops. Better late than never, right? RIGHT?!?!?!? At least I'm telling myself that.