First I had compasses and protractors and had them make 3 different circles in their notebooks. Then they measured the radius of each and recorded it. Then they "carefully" used a ruler (my compasses are the orange cool ones with a ruler on them) to "wrap around the circle" one radius length. Then they measured the angles.
We talked about how we're human, and it will be off, but we noticed the numbers were similar. Here's the page of my notes.
The next thing that worked was a table. I made them create a table with 3 columns, angle in standard position, degree measure, radian measure. One row at a time, I would give them one of the values, and they had to figure out the other two, and then we'd discuss it and their strategies. The highlighted portion is what was given to them.
I liked this because it's all ordered in one table, and they can absorb it and see connections and such as opposed to my last year's notes where I sloppily just did a few around the page and put all the information on the graph.