I assigned this to be done outside class today, since tomorrow's lesson is "Trig on the Unit Circle." You should go read it because otherwise I'd just be copying and pasting the whole thing.
I'm a little flail-y, still, about where to take it tomorrow. I have never had success getting the cherubs to see the connection between the coordinates on the unit circle and sine and cosine. Or when I have, it's been fleeting. I was thinking we'd discuss the patterns and shortcuts, and then I'd pose "Let's come up with a way to find precise coordinates for 57.4 degrees without having to draw it." But I'd love to hear better ideas.
Anyway, I thought it would be helpful to make the files I'm using available. They are here. One's a GSP and the other is an Excel.