Here is a Smart Notebook with tools to help your class better understand circles. Making use of Geogebra, the teacher can instantly change the circle by "dragging" a radius. There are "check boxes" so you can display metrics like the radius, diameter, circumference and area. As you change the radius, all of the circle's metrics are updated instantly.This Smart Notebook makes it easy to instantly create different circle examples with all of the answers. What a time saver!