This is a great extension activity, homework assignment, or station.
Students are given one piece of information (radius, diameter, circumference, or area) and must use it to find the other three values.
There are four questions and it took my students about 20 minutes to complete (without calculators).
This assignment is a great tool to determine which students really have a good understanding of this concept. If they struggled with the last two (working backwards from circumference and area), then I knew they needed some additional help with understanding the formulas and how they work.
*** Also can be used as a matching game for struggling students ***
If I had students who were struggling that could not complete the assignment as is, I would print out the answer sheet and cut them into cards for them to match together.