Working with
Reference Angles and Triangles
Topic Index | Algebra2/Trig Index | Regents Exam Prep Center

 

Solve the following problems pertaining to special right triangles.

1.  The value of   cos 390  is equal to the value of
                                                       

Choose:

sin 30
sin 60
- sin 30

 Answer

 


 

2.   Write  cos 280  as a positive acute angle.
                                                               

Choose:

cos 10
cos 80
cos 85

 Answer

 

 

3.    Write  tan(-110)  as a positive acute angle.
                                                                         

Choose:

tan 10
tan 20
tan 70

 Answer

 

 

4.    Give an exact value for   .

Choose:

1/2
24
-1/2

 Answer

 

 

5.

If  is an angle in standard position and B(-3,4) is a point on the terminal side of the angle, what is the value of sin .
                                                   

                                                         

Choose:

3/5
-3/5
4/5

-4/5

 Answer

 

 

6.

Find the exact value of  sec for angle in standard position if the point (-5,4) lies on its terminal side.     

Choose:




 Answer

 

 

7.

The line y = 3x creates an acute angle when it crosses the x-axis.  Find the exact value of sec .


    

Choose:




 Answer