A r L 2 A r L 2 Here is a three-tier birthday cake 6 6 inches tall with a diameter of 10 10 inches. The area of a circle is the number of square units inside that circle. While this might seem impossible it is doable if you divide the circle into thinner and thinner slices until parts become infinitesimally small and can form an exact.
The formula for the area of a circle is pi multiplied by the radius of the circle squared.
D 2 r. Insert cartoon drawing or animate a birthday cake and show it getting cut up. The area of a circle is the number of square units inside that circle. A C2 4p.