Lesson 7

Are You Ready?

 

Complete these questions. If you experience difficulty and need help, visit Refresher or contact your teacher.

1. Use your calculator (remembering to set your calculator to degree mode) to evaluate the following trigonometric ratios to four decimals places.
   1. cos 45°
   2. cos 28°
   3. cos 17°
   4. cos 53°
      
      
   Answer
2. Use your calculator to find ∠A in each of the following trigonometric ratios. (Round each answer to the nearest tenth.)
   1. cos A = 0.4572
   2. cos A = 0.9101
   3. cos A = 0.1887
   4. cos A = 0.7744
      
      
   Answer
3. Solve for the unknown side x using the cosine ratio:
   
   
    
   
   
   Round each answer to the nearest tenth of a unit.
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      Answer
   2. 
      
      
      Answer
4. Solve for the unknown ∠θ using the cosine ratio:
   
   
    
   
   
   Round each answer to the nearest degree.
   1. 
      
      
      Answer
   2. 
      
      
      Answer

If you answered the Are You Ready? questions without difficulty, move to Discover.

 

If you found the Are You Ready? questions difficult, complete Refresher.