Formulas
Coordinates
Radians to Degrees
Reference Angles
100
This trigonometry ratio uses the fraction adjacent over hypotenuse.
What is cosine(x)
100
sin 90 degrees
What is 1
100

How many radians is 180 degrees?

What is pi/6.

100

What is the reference angle for 75 degrees?

75 degrees

200
This equation is a way of finding the x-coordinate on a unit circle.
What is x=cos(theta)
200
sine of 150 degrees
What is 1/2 or .5
200

How many radians is 90 degrees?

What is pi/2.

200

What is the reference angle for 220 degrees?

40 degrees

300
This equation gives us the y-coordinate on the unit circle.
What is y=sin(theta)
300

The cosine of 3*pi/2.

0

300

How many radians is 135 degrees?

What is 3*pi/4.

300

What is the reference angle for 3pi/4?

pi/4

400
This trigonometry ratio uses the fraction hypotenuse over opposite.
What is cosecant(theta)
400
The sine of 4*pi/3.
What is - sqrt(3)/2
400

How many radians is 330 degrees?

What is 11*pi/6.

400

What is the reference angle for 11pi/6?

pi/6

500

This equation uses the terms of sine and cosine to find another trig. ratio.

tangent(theta)

500
sine of 7*pi/4.
What is -sqrt(2)/2
500

How many radians is 390 degrees?

What is 13*pi/6.

500

What is the reference angle for 7pi/10?

pi/5
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