Circles are studied in almost every grade. Now that we’re getting into high school geometry the facts that we knew about circles before have to be solidified.
We can’t forget the area and circumference formulas any more. We can’t forget what radius, circumference, and diameter are. You can find an explanation of these basic concepts here: http://www.kidsmathgamesonline.com/facts/geometry/circles.html
Classwork and Homework: