As part of one of my undergraduate classes, I was to come up with a unit plan. I chose to do mine on circles. I found an activity about a carousel in one of the frameworks for Atlanta Public Schools. I built on this task and formulated the accompanying material (homework, probing questions, etc). I will include my completed work here below.
Here is the task.
Here is a gsp file (be sure to scroll right to see all the images).
Here is the task solutions.
Here is the lesson plan.
Here is the circle template.
Here is a pdf of a Power Point Presentation if needed.
Here is the homework.