Unit Circle

The diameter of C is 2r.

The circumference of C is r.

The circumference of C is 2r.

One quarter of the circle has length $$\frac{\pi r}{4}$$

One quarter of the circle has length $$\frac{\pi r}{2}$$

$$\frac{1}{6}$$  

$$\frac{\pi}{6}$$  

$$\frac{1}{12}$$  

12

$$\frac{\pi}{4}$$  

$$\frac{\pi}{6}$$  

$$\frac{\pi}{12}$$  

$$\frac{\pi}{8}$$  

$$\frac{1}{6}$$  

$$\frac{\pi}{6}$$  

$$\frac{1}{4}$$  

12

$$\frac{1}{6}$$  

$$\frac{\pi}{6}$$  

$$\frac{1}{3}$$  

12

$$\frac{\pi}{4}$$  

$$\frac{\pi}{6}$$  

$$\frac{\pi}{12}$$  

$$\frac{\pi}{3}$$  

$$\frac{\pi}{4}$$  

$$\frac{\pi}{6}$$  

$$\pi$$  

$$\frac{\pi}{3}$$  

$$\frac{3}{4}$$  

$$\frac{\pi}{6}$$  

$$\frac{1}{3}$$  

12

$$\frac{\pi}{2}$$

$$\pi$$

$$2\pi$$

$$5\pi$$

$$10\pi$$

$$\frac{\pi}{4}$$  

$$\frac{7\pi}{4}$$  

$$\pi$$  

$$\frac{\pi}{4}$$  

$$\pi$$

$$\frac{\pi}{2}$$

$$\frac{\pi}{4}$$

$$\frac{\pi}{8}$$

$$\pi$$

$$\frac{\pi}{2}$$

$$\frac{\pi}{4}$$

$$\frac{\pi}{6}$$

(17,0)

(-17,0)

(0,17)

(0,-17)

(17,0)

(-17,0)

(0,17)

(0,-17)