4.1 Review

Convert 150⁰ to radians

• 5π/6
• 3π/4
• 7π/6
• 2π/3

Convert 100⁰ to radians

• 5π/9
• π/2
• 5π/8
• 5π/6

What is 4π/3 radians in degrees?
 

• 120
• 240
• 210
• 270

What is 2π/3 radians in degrees? 

• 150
• 120
• 180
•  30

Find a coterminal angle to 5°.

• 365°

• 255°

• -220°

• -365°

Which of the following angles are co-terminal to  $-\frac{\pi}{2}$  ?

•  $\frac{3\pi}{2}$  ,  $\frac{-5\pi}{2}$  

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

•  $\frac{5\pi}{2}$  ,  $\frac{-\pi}{2}$  

•  $\frac{5\pi}{2}$  ,  $-\frac{7\pi}{2}$  

Which of the following angles are co-terminal to  $\frac{5\pi}{6}$  ?

•  $\frac{17\pi}{6}$  ,  $\frac{-7\pi}{6}$  

•  $-\frac{\pi}{6}$  ,  $\frac{11\pi}{6}$  

•  $\frac{23\pi}{6}$  ,  $\frac{-13\pi}{6}$  

•  $\frac{-5\pi}{6}$  ,  $\frac{7\pi}{6}$  

What angle is complementary to

 $\frac{\pi}{4}$  ?

•  $\frac{\pi}{3}$  

•  $\frac{\pi}{2}$  

•  $\frac{\pi}{4}$  

•  $\frac{\pi}{6}$  

What angle is supplementary to

 $\frac{2\pi}{3}$  ?

•  $\frac{2\pi}{3}$  

•  $\frac{\pi}{4}$  

•  $\frac{\pi}{3}$  

•  $\pi$  

Find the arc length.  Leave your answer in terms of π.

• 7/4π
• 7/2π
• 1/8π
• 45π