This Puzzle is can be used to assess student understanding of circle vocabulary. As an extension, once the students get the 9 peices together correctly in a square, they can use the blank squares to make peices to finish the outside border of the puzzle.
It is a great activity and students love it! I would copy and laminate the printed 9 peices of the puzzle, and let the students cut out their peices on plain paper.
Kids love puzzles and I know they will love this one!