Radian Trig Coordinates

A

1

This is the point on the unit circle associated with  pi  radians 

(-1, 0)

2

This is the point on the unit circle associated with  pi/2  radians

(0, 1)

3

This is the point on the unit circle associated with  {2pi}/3  radians

(-0.5, 0.866)

4

The point on the unit circle associated with this angle is (0.866, -0.5)

{11pi}/6

radians 

5

The point on the unit circle associated with this angle is (-0.707, 0.707)

{3pi}/4

radians

B

1

The x-coordinate of any point on the unit circle with angle  theta  is equal to this

cos(theta)

2

The y-coordinate of any point on the unit circle with angle theta is equal to this

sin(theta)

3

This is the number of radians in a full circle

2pi

4

This is the radian measure equivalent to 180º

pi

radians

5

This is the radian measure equivalent to 270º

{3pi}/2

radians

C

1

The point on the unit circle associated with this angle has an x-coordinate of 0.5 and a negative y-coordinate

{5pi}/3

radians

2

For this angle, cos(theta)=cos({2pi}/3) but sin(theta) is negative

{4pi}/3

radians

3

For this angle, both cos(theta) and sin(theta) are -0.707

{5pi}/4

radians

4

For this angle, cos(theta)=0.866 and sin(theta) is positive

pi/6

radians

5

This is the angle for which  cos(theta)=sin(theta) and  cos(theta)>0 

pi/4

radians