The Important Angles
Topic Index | Algebra2/Trig Index | Regents Exam Prep Center

 

Be sure you know, or know how to quickly determine, the following information. 
If you know the special right triangles and the trig graphs
you already know how to determine this information.


(in degrees)
30º 45º 60º 90º 180º 270º

(in radians)
0
0
(0.5)

(0.707)

(0.866)
1 0 -1
1
(0.866)

(0.707)

(0.5)
0 -1 0
0
(0.577)
1
(1.732)
undefined 0 undefined


 If you can fill in the chart above, you can also complete the chart below by using the relationships between functions and their reciprocal functions.


(in degrees)
30º 45º 60º 90º 180º 270º

(in radians)
0

undefined
2
(1.414)

(1.547)
1
undefined
-1
1
(1.547)

(1.414)
2
undefined
-1
undefined

undefined

(1.732) 
1
(0.577)
0
undefined
0