Trigonometric Ratios of Special Triangles

 Which of the following are the trigonometric special angles?

• 45°, 20°, 0° ,90° ,60°
  

• 0°, 90°, 60°, 35°, 45°
  

• 50°, 20°, 0°, 80°, 60°
  

• 0°, 90°, 60°, 30°, 45°
  

What is  $\sin45\degree$  ?

• 1

•  $\frac{\sqrt{3}}{\ \ 2}$  
  

•  $\frac{1}{2}$  
  

•  $\frac{\sqrt{2}}{\ \ 2}$  
  

What is tan  $30\degree?$  

•  $\frac{\sqrt{3}}{\ \ 2}$  
  

•  $\frac{1}{2}$ 

•  $\frac{\sqrt{2}}{\ \ 2}$  
  

•  $\frac{\sqrt{3}}{\ \ 3}$ 

 Without using a calculator, find the value of  $\tan45\degree$  

• 0

• 1

•  $\frac{1}{2}$  

•  $\sqrt{3}$  

What angle measurement of special right triangles do sine and cosine have the same value?

• $90\degree$

• $60\degree$
  

• $45\degree$
  

• $30\degree$
  

Without using a calculator, find the value of  $\cos\ 30\degree\ ?$ 

•  $1$  
  

•  $\frac{1}{2}$ 

•  $\frac{\sqrt{3}}{\ \ 2}$ 

•  $\frac{\sqrt{2}}{\ \ 2}$ 

Without using a calculator, find the value of  $\cos90\degree$  .

• 0

• 1

•  $\frac{\sqrt{2}}{\ \ 2}$  

• undefined

What is  $\sin60\degree\ ?$  

•  $\frac{1}{2}$  

•  $\frac{\sqrt{2}}{\ \ 2}$ 

•  $\frac{\sqrt{3}}{\ \ 2}$ 

•  $\frac{\sqrt{3}}{\ \ \ 3}$  

What is  $\tan60\degree$  

•  $1$ 

•   $\sqrt{3\ }$ 

•  $\frac{\sqrt{3}}{\ \ 2}$ 

•  $\frac{1}{2}$ 

Without using a calculator, find the value of  $\cos60\degree$ .

• 1

•  $\frac{\sqrt{3}}{\ \ 2}$  
  

•  $\frac{1}{2}$  
  

•  $\sqrt{3}$