Circumference & Area of Circles (Intro)

$$2\times\pi\times r$$

$$\pi\times r\times r$$

$$\pi\times d$$

$$2\pi r$$

$$\pi r^2$$

$$\pi\times r\times r$$

$$2\times\pi\times12$$

$$\pi\times12\times12$$

$$\pi\times12$$

$$12\div\pi$$

$$2\times\pi\times12$$

$$\pi\times12\times12$$

$$\pi\times12$$

$$12\div\pi$$

$$\pi\times24$$

$$\pi\times8$$

$$2\times\pi\times8$$

$$\pi\times8\times8$$

$$\pi\times16$$

$$\pi\times8$$

$$2\times\pi\times8$$

$$\pi\times8\times8$$

$$\pi\times20\times20$$

$$\pi\times40$$

$$2\times\pi\times20$$

$$40\div\pi$$

$$\pi\times20\times20$$

$$\pi\times40$$

$$2\times\pi\div20$$

$$40\div\pi$$

$$\pi\times45$$

$$\pi\times45\times45$$

$$2\times\pi\times45$$

$$\pi\times45+45$$

$$\pi\times45$$

$$\pi\times45\times45$$

$$2\times\pi\times45$$

$$\pi\times45+45$$