Reference Angles

1.   sin A = 0.9877.  What are the two primary angles?  Round your answer to the nearest degree.

   A = 81^o or   99^o

   A = 81^o or    261^o

   A = 81^o or   279^o

2.   tan A = 1.080.  What are the two primary angles?  Round your answer to the nearest tenth degree.

  A = 47.2^o and 132.2^o

  A = 47.2^o and 227.2^o

  A = 47.2^o and 312.8^o

3. cos A = -0.545.  What are the two primary angles?  Round your answer to the nearest degree.

  A = 123^o and 57^o

  A = 123^o and 237^o

  A = 123^o and 303^o

4. What is the reference angle of A if A = 225^o?

  A_r = 45^o

  A_r = 30^o

  A_r = 60^o

5. What is the reference angle of A if A = 110^o?

 A_r = 10^o

 A_r = 20^o

 A_r = 70^o