This reference sheet is an easy way for students to remember key terms about the geometry of a circle such as area, circumference, diameter, radius, and pi. Great for a math binder or to print out as a classroom poster.
Use graph paper to demonstrate the ratio of PI for both Circumference and Area. Refer to the demonstration of Circumference performed for you in the last Math Antics Video, What is PI? Use that demonstration to come up with your own for the ratio of PI when calculating the Area of a circle.