Circumference of Circles – Task Card Pixel Art. This engaging activity is perfect for distance learning, homework, centers, early finishers, quiz/test review, or extra practice. It is a twelve-question mystery drawing that provides students with self-grading practice on working with circumference of circles. Your students will reveal the picture by correctly solving the problems. They will choose their problem by using the drop-down menu. When answered correctly, the answer cell will turn green,