Know Thy Unit Circle -- First Quadrant Only

In the unit circle, the "special angles", from small to large, are...

• 
  

  $\frac{\pi}{4},\ \frac{\pi}{6},\ \frac{\pi}{3}$
  

• $\frac{\pi}{3},\ \frac{\pi}{4},\ \frac{\pi}{6}$

• $\frac{\pi}{6},\ \frac{\pi}{4},\ \frac{\pi}{3}$

• $\frac{\pi}{2},\ \frac{\pi}{3},\ \frac{\pi}{4}$

Converting degree to radians, the following statement is true.

• $15\degree=\frac{\pi}{6}$

• $30\degree=\frac{\pi}{6}$

• $45\degree=\frac{\pi}{3}$

• $60\degree=\frac{\pi}{6}$

The "unit circle" gets its name because it is a circle whose radius is...

• 1 unit.

• $\sqrt{3}$ units.

• 2 units.

• twice the diameter.

Which of the following statements is false?

• $\frac{\pi}{2}=90\degree$

• $\frac{\pi}{3}=60\degree$

• $\frac{\pi}{4}=45\degree$

• $\frac{\pi}{6}=20\degree$

 $\sin90\degree=$  

•  $\frac{1}{2}$  

•  $\frac{\sqrt{3}}{2}$  

•  $\frac{\sqrt{2}}{2}$  

• 0

• 1

 $\sin30\degree=$  

•  $\frac{1}{2}$  

•  $\frac{\sqrt{3}}{2}$  

•  $\frac{\sqrt{2}}{2}$  

• 0

• 1

 $\cos60\degree=$  

•  $\frac{1}{2}$  

•  $\frac{\sqrt{3}}{2}$  

•  $\frac{\sqrt{2}}{2}$  

• 0

• 1

 $\cos45\degree=$  

•  $\frac{1}{2}$  

•  $\frac{\sqrt{3}}{2}$  

•  $\frac{\sqrt{2}}{2}$  

• 0

• 1

 $\sin60\degree=$  

•  $\frac{1}{2}$  

•  $\frac{\sqrt{3}}{2}$  

•  $\frac{\sqrt{2}}{2}$  

• 0

• 1

 $\cos90\degree=$  

•  $\frac{1}{2}$  

•  $\frac{\sqrt{3}}{2}$  

•  $\frac{\sqrt{2}}{2}$  

• 0

• 1